In comparison to the fitears as per my description above,:
TG334: mindblowing mids...............quality of the mids are simply the best money can buy, but sometimes I find it too mid-centric overall. and lots of mid bass too. The combination of the very prominent mids, as well as the mid-bass, make it sometimes tiring to listen to the 334, especially when you crank up the volume a bit to squeeze out the highs. For all my love for the 334, I think the highs are a bit problematic - to my ears there's a hole between the lower-highs and the ultra-highs, and the result is that it sounds dark overall, but if you listen hard you can actually hear some pretty decent high extension. It is a top class iem which shall be an excellent one-of-a-kind addition to any earphone collections, but it won't be (and should not be) the endgame all-kill iem for anyone. MH335 and the fitears (or even the parterres, despite it being promoted as an iem for classical music exclusively) are more versatile than the 334.