Yes, I have both. Frankly, I wouldn't call either 'bright', and it's not really a 'this is warmer than that' story. E2 has a bit of recessed treble but is pretty linear otherwise. Empy has a bit of emphasized mid-bass/lower mids, which to me make it seem a bit warmer, in contrast to the slightly more emphasized treble, which make it seem a bit brighter.
Mostly agree with this, although I would have said:
Empyrean with leather pads > Empyrean with velour pads > Ether 2 with standard pads
...
Agree that E2 seems 'thinner', but disagree about sub-bass and headstage. I find the E2 bass very well extended, with great character. E2 stage is open and expansive while Empy stage is enveloping. To me, Empy seems 'lush' while E2 seems 'spare'. And for me, voices can go either way, depending on the singer and the mix. And, I (politely I hope) disagree with the overall assessment of of E2 being 'nothing to compare' with Empy. I like them both as Empy has really been growing on me. But E2 is wonderful for tracks which are mixed to have an open, airy stage (Loreena McKennitt).
Honestly, at first listen, Empy might seem more appealing as it has a more 'fun', accessible tonality, while E2 can seem leaner and less musical. But over time, Empy turns out to have excellent technicalities which overcome it's 'fun' facade, while E2 presents a refined and detailed soundscape.
BTW, switching to a silver cable, swapping tubes in my Liquid Platinum amp (from Siemens E88CC/CCa to Brimar CV-2492) and rolling in a Gumby vs my Denafrips Pontus DAC all have helped me appreciate the Empy more. Note that I only use the suede Empy pads -- I find the leather Empy pads to be too warm (tonally, not temperature).