Since buying the SE846s, I have sold my UM Miracles and demoed the TG!334s, AKG3003, and Sennheiser IE800 as well as many other lower priced IEMs. Based on everything I've tried, nothing is as good as the SE846s at all things without getting into full custom territory and spending $1500+ (i.e. Noble K10, Roxanne, etc.)
The 846s are not bright, but are very accurate with the white filters. If you like a bright sound though they may not be as bright as you want (for example, the FIDUE A83 is a nice IEM which is not as good as the SE846, but offers a brighter treble than the SE846).
Soundstage is excellent - not huge, but extremely coherent and well defined, especially through the midrange. Overall sound to my ears is exactly like being in the same room as the instruments. The SE846 is the very first IEM I have heard which accurately produces the sound, feel and ambience of live music - they are awesome and worth every cent!