one of my best friend's is a 4w3 entp. it's an interesting combination.
i think the e4 example of glowering at someone with envy is just common 4 practice. i do this too, but usually it's between a sandwich of 5 rationalization, Ti self-justification, etc. it's really really easy for the F nature to focus entirely on implicit subtext that could be perceived as threatening. the process of comparison is really just awful when you are hyper-aware/sensitive of the implications, when you see the way those meanings relate to the whole, and when you don't have the resources or balance in the moment to keep moving rather than fixate on the possible negative implications. i'm just a w4, but it still seriously fucks me up at times. the rationalization doesn't help either, the tension between the types helps provide, tho, an awareness that neither perspective is right by itself, and i need to learn to accept more than i do, keep my eyes open, go with it, and move on.
5w4 and 3w4 are an interesting contrast. they are two of the most private enneagram types. the w4 is young and babylike, and produces a desire for authenticity that drives expression amidst the 3 acting/selling and the 5 withholding. i see 4w3 as more light, aristocratic, natural-seeming, easy to like, faultlessly charming, and going with the flow than either of the w4 types. the w4 is usually a younger, less advanced e4 version, whereas 4w3 turns their own inner struggles into a desire to impact the larger milieu, which is usually great. very ambitious. my 4w3 friend and i spend a lot of time discussing how art and business fit together. he's a natural entp marketer, and a very talented artist with great ideas, social experiments, etc. we just see art as the process by which you create a brand identity, situate your product within a larger social sphere, create economic self-sufficiency, pay more attention to and invest more effort in REACHING your audience, and think about models of group work that help create an environment that is colloboratively productive. 4w3s seem to have a natural nose for this, and it washes away a lot of the pretense and the red tape aspects of the process and gets straight to the fucking point.
my favorite 4w3 was walt whitman (tho i think a lot of great writers and playwrights, especially, are 4w3s), who read emerson's essay "the poet" and tried to become the epic bard of the american self, the teller of the american 19th century zeitgeist, and a metaphysical/mystic poet disclosing the cosmic purpose of the world to itself. it's pretty good, and his desire to reach the common man, the working class, the marginal subjectivities, the aboriginal activities, using the actual language of THEM and not his own expectant "poetic" language, it just all fits (he's enfp). he seems so strategic when you analyze his approach. he loses touch with himself at times but *usually* realizes his mistake before he gets too carried away and propagandaist (which is the downside of being so scattered and focusing on outward image-projection rather than inward image self-knowledge/self-analysis).
also, as far as 4w3 nfjs go, i'd suggest leonard cohen. i'd guess 4w3 is more likely enfj than infj, tho regardless a 4w3 infj would have to look pretty damn enfj, and it would be difficult to discern that Ni really was dominant over Fe. tho 4w3 having Se tertiary over inferior and Fe dom over Ni would seem more immediately adaptable and look way more smooth, natural, etc.