I had both...well I still technically own both but they've not been with me for the past 6 weeks. Drop @CEETEE a message to ask him about this as he has both my earphones at the moment.
Personally, I've either been FitEared or I'm just not enjoying the SE846. I actually bought the 846 in hopes that it'll replace my TG!334 addiction but alas, it hasn't and I'm asking CEETEE to help me sell the SE846.
This is now going by memory 'cos as mentioned I've not had both for some time but to me although the SE846 has a larger staging, it seemed to have lacked the microdetail and resolution which I felt the TG!334 had.
Your description of the SE846/TG334 is quite interesting. I've been considering the SE846 myself lately. But I'm not too keen to hear about the lesser microdetailing/resolution compared to the TG334.... this is because I currently have the FA-4E which is so good it caused me to sell the TG334, with better microdetailing and resolution. It's a shockingly good earphone for a touch over $500. I'll keep reading up on the SE846 I guess.