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Have you actually heard the EX600?
I haven't heard the SA6 or SE425, but of all 21 phones listed in my sig, the Sony EX600 has some of the best bass response I've heard, with some of the very best timbre! Saying it "suffers from mid overload" is way off the mark - if anything, the mid-range might be considered slightly recessed (which I don't think it is, BTW). If you, in fact, have heard them, all I can say is you either had a (very) bad fit, a faulty pair (which is unlikely) or your concept of good sound is completely different to mine.
Actually I have, however I might have been exaggerating. The mid "overload" presents is a large ~3kHz hump. There's a minor amount of sibilance as well (noticeable as "hotter" sound). Maybe you're listening louder so the boost is less obvious or it's just my ears.
Bass is of course best of these three, they're dynamics after all, however it's nowhere near great. It's overly fast (yes, there is such a thing) and with not enough decay. GR07 beat the quality handily. It's good quantity though and there's not a lot midbass bleed, however it exists. Extension is ok. Soundstaging is pretty good, however the stage is a bit near and shallow.
They're pretty overpriced in many places. I see Amazon has for $150 - that's a good price, they're worth about that much. But here they're more to the tune of $250, which is unacceptable. (Brand markup like for Shure?) New Atrios are a better pick in my opinion at the lower price, the higher one and you can get IE8 or MTPG, which mop the floor with these in general.
(Note: IE8 at the lowest bass setting or +1. Anything above that is pretty much insane basshead mode.
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The other two are more for fans of absolute mid and highs accuracy at the cost in bass quantity and decay.
SA6 are the smoother and lower mid based (not boosted!) sound, pretty linear though and among the best bass for an armature (with the b+ or b++ filter), it can compete with some multiple BA IEMs. Extension is ok bass side for a BA IEM, not that great in highs. The sound is rich in harmonics, sounding lush or reverb-like. Soundstaging is great with very deep insertion, which is trivial, since they're tiny and tiny nozzle diameter. Their main issue was build quality, specifically the cable. The newer ones should have a good cable, SA6-R has different cabling as well (incl. IEM-side plugs and sockets), but might sport some sound changes.
Shure SE425 are pretty neutral sounding, slightly harsher than SA6 and colder, a bit worse bass decay, far less lush. The key selling point of those over SA6 would be build quality. Soundstaging is in my opinion slightly inferior to SA6, certain kinds of percussion steps too much forward. They're also more expensive. Comfort is IMO slightly inferior too.
