The classic win-some-lose-some situation.
But I think yes, W4R have that thick-ish mid body you seem to be looking for. And yes, I do think that W4R's treble is detailed and quite extended. It's polite, it will not smack your face up front with gobs of details, but if you pay attention and specifically look for the treble detail, it's definitely there. So you gain mid body in exchange of up-front, exciting treble.
But as far as I can remember, PFE have thicker bass body, while W4R's is thinner. So if you like PFE's bass, you might want to put that in consideration.
Wow, you nailed it on the head with all of this. I'm listening to the 4R now. The treble is better than I expected, but not as extended as the pfe. It lacks the true "airy-ness" of the pfe232. But the treble is still very good and I would call it more forgiving in general. It's not muffled, but almost soft in comparison. The mid range is exactly what I was looking for as you expected. The bass is another story. It is probably the second best bass I've heard in a universal iem. The first is the pfe232. It sounds more flat in nature in the bass, but doesn't extend into the sub as much. There are certain songs that the lowest notes don't sound as level in volume as they do on the pfe.
Overall, I would really say that these two sets, as far as I've heard the 4r, are really very close but different. I wouldn't say either is necessarily better than the other per se, but it would depend on wether you value the treble and bass over the mids and flatness. I'm not sure which I prefer yet! haha. :-o