My grain of salt: I haven't heard the 334, was about to pull the trigger on one a couple of weeks ago but hesitated due to some reviews of it being "bassy"
I have being looking for for a good iem for causal listening and maybe in the future purchase a reference one (angie, kaiser 10U, etc..)
Decided to pull the trigger on a new f11, purchased to price japan, and don't regret it.
The first thing I thought when I plugged them to my explorer2 was: "baby lcd-xs" (no thinking, came out of the blue)
Comfort: Second to none, I use them with ortofon large eartips, great seal and very soft.
Bass: The right amount for my taste, enough slam and presence - like a discrete frame in a nice painting
Mids: Excellent, lushier than etys in my opinion, not dry at all, great separation and ambience
Highs: Again just in the middle, not strident or sparky
I have tried them with iphone 6 and explorer2 dac amp using a imac and audirvana + as source.
For what I hear, I can expect that the performance will be fantastic with RWAK240+ and BTG balanced cable. There is the possibility they will become my refrence IEM