Hmm. I'm going to go on personal experience here...
NT's: My father is an INTJ. We both love to play with ideas (despite my 'F' inclination, our discussions generally have a great logicality to them - but are also quite rich. We share a fascination with philosophy) and learn from each other BUT only when feathers are not ruffled the wrong way. He's too sure of himself - it borders on arrogance - and then calls ME arrogant for not coming round to his way of thinking! Drives me crraaazzzy.
Then again, a dear friend of mine is almost certainly an INTP and my half-brother is an ENTP (both with fairly well-developed 'F') and I think it's nigh defiance of the laws of physics for us to ever disagree to the point of coming to blows. We bear each others company extremely well, and are able to have great theory-heavy conversations without stepping on each others toes.
NT's = My life-teachers, as well as my students.
SP's: Two of my closest friends are SP's. My best friend from high school (ESTP) who I've occasionally conflicted with in the past, but would go to the ends of the earth for. It took us a while to get where we are now (Six-ish years, actually) but we've come to understand each other extremely well (eg - for me to not feel rejected by her occasionally TOO careless attitude) and have had quiiiite the adventures. She actually loves the philosophically-inclined questions I often pose for her that she otherwise would've never thought about. The other (ESFP) I get along with famously, and has been a good friend since I met him two years ago. By that I mean you could hear the 'click' when we met! He has an adventerous spirit and is excited by possibilities like me - we have the most entertaining conversations, and plan the most daring of escapades (which will, some day, be carried out....maybe....if I don't dream up another half-dozen to replace the ones already made, and he go along with it) We both love and deeply care for people, understanding them on different levels. (I'm also INSANELY attracted to him, but that's another story

) I've never really tried to engage him on a wholly theoretical level, however.
SP's = My playmates.
SJ's: Again, two examples spring immediately to mind. My mother, and my best friend. My ma (ISFJ) is absolutely the kindest, most sympathetic person on the planet - who happens to love me unconditionally. And she also happens to drive me nuts. I love and would do anything for that woman, but living with her was a total bitch. OH THE PERFECTIONISM. OH THE NAGGING. OH THE GULLIBILITY. OH THE WORRY WORRY WORRY. (She also doesn't appreciate black humour quiiiite as much as me, heh) I know it's all because she cares about me, worries about my safety and wants to teach me tidiness (as well as her own intense dislike of mess) but good GOD woman, get off my back! It's a damn spoon in the sink! A spoon! A SPOOOON! She also believes things far too easily, without sufficient evidence. That being said, she is one of the best people I know

Ah, the other. My best friend (ESFJ) Another perfect example of someone who I would willingly walk through a rabid scorpion pit for - and yet another perfect example of someone who drives me completely insane. He's less emotionally gullible and more laid-back than my mother, having much less of a compulsion to ABSOLUTE CLEANLINESS - actually, the rigidity in him I find frustrating is intellectually. He's very smart and generally very logical but SETS his mind about things. They have to make reasonable sense to him and be from a reputable source, but once he's convinced - he's convinced. End of story. No other evidence to the contrary will convince him otherwise. YET he thinks himself very open-minded....can you see how this would drive a possibility-driven NF to tears of exasperation?!
On the whole, we obviously get along (hence, 'best friend') but lordy help those nearby when we get into a heated theoretical discussion!
(Oh, and I just remembered I've decided my brother is a slightly-rebellious ESTJ. We get along on the surface and both love doing insane thrill-seeking things - but we do not understand each other. At all)
SJ's = My loveable (if frustrating) foils.
And last, but never least, my fellows:
NF's: It's such a pity only one of my immediate friend/family circle I can confidently recognize as a fellow NF - and he's a bit of an unhealthy ENFJ. (Can be brutally sarcastic but hyper-sensitive to even the most innocent barbs thrown his way, drama-queen to the extreme - he IS getting better though, I think it's mostly due to a childhood where bullying was a common theme) Most of the time I get along with this ENFJ, however it's highly annoying to be mocked and then have to walk around on eggshells in return! He's getting better as his self-esteem improves though, and I think that past this, we could connect better. We're both music theatre nuts with plenty in common - we're both constantly performing, and we make each other laugh. Other than him, there's also my best friend's girlfriend (INFJ) - who I have yet to become close to, but have thus far connected with. We have the most interesting conversations, and understand each others crazy perception of reality.
'NF's' also make up the only romantic relationship thus far that has been meaningful. Spiritual, cognitive, creative, emotional connection. (Again, INFJ)
NF's = I have yet to find the perfect title to define MY dealings with other NF's but: My fellow spiritual warriors
....Sorry for that massive ramble. As I said, I wanted to make judgements solely based on experience, so - out came that novel!!
Hope it was insightful to someone, somewhere
