I didn't hear them that way else I wouldn't have cancelled my 846 pre-order after the advanced demo as I love my lcd3. To me the 846 reminds me more of the d7100. Maybe I should get an extended loaner and fiddle with all the filters and tips to get this lcd3 sound you are getting as it was not even close for me.
The SE846 provides a more distinct sense of space as I find it images better than the 334's. It's not quite as thick as the 334 as well. Both are great iem's, but I prefer the Shure's customizable options and the fit is superior for my ears. I'd place the 846 anywhere between the LCD3-LCD2.2. It's really the speed that makes me incline towards the LCD3 as every instrument is well defined whereas the LCD2 is somewhat more like being enclosed in a hall between two walls of sound.
I say give it a try. I only tried my friend's 334! twice, and I'd say it's darker than both the LCD3 and 846; but it's still top notch! I recommend you try them out before spending your money because of what I've said!