OK... so the RS2e vs GH1 comparison is not quite as straightforward as I would have imagined.
For starters, I want to compare on an even keel for folks here to get a useful comparison. That means shutting off my EQ plugin. But, I find the RS2e too bright & fatiguing in the stock configuration and no EQ. Taping the bowls helps a ton, bringing the treble & bass into better balance. The treble is still prominent, so I would not call them neutral, but I'm able to listen happily without fatigue, and enjoy the excellent midrange.
So, first caveat is that I am using my RS2e with taped bowls for all of this comparison.
On to the GH1...
Straight out of the box, I noticed the overall tonal balance is much more neutral than the RS2e. Treble is in proportion with the midrange, while the bass is indeed stronger without being out of proportion.
After some swapping back and forth, two significant things stand out:
1) The RS2e midrange is more open / spacious and has more presence. In comparison, the GH1 midrange is a bit recessed, and sounds slightly congested. Now, I'm a bit cautious about this trait ... the GH1 are brand new, while my RS2e have 300-400 hours on them. The tape mod seems to help open up and bring forward the GH1 midrange, bringing it closer to the RS2e. I'll need to listen more, but I think the RS2e are slightly ahead.
2) The GH1 does have a couple dB more bass overall than the taped RS2e, including a slight upper-bass emphasis that I'm undecided about. On the one hand, this gives the GH1 a nicer weight with double-bass (classical, jazz), but also leaves it sounding a touch tubby compared to the RS2e on some material (pop). The taped RS2e bass is still slightly on the lean side of neutral, but what's there is a bit tighter and more articulate. While I appreciate the increased bass on the GH1, I'm no basshead, so I'm on the fence about this. I like the added bass response of the GH1, but I also like the bass expressiveness in the RS2e. Again, I'm hesistant about making too much of these differences at this stage of (non)break-in. After taping the GH1 bowls, the GH1 does gain even more bass response, though the treble balance seems to be affected less than it is on the RS2e.
Except for quantity (RS2e has more obviously), the treble character is broadly similar in terms of smoothness and clarity. I haven't focused enough on this area to give a good description of the differences yet.
So, after my first half-day with them, my initial impression in favour of the GH1 has softened. The RS2e can hold it's own against the GH1. I need to play more with tape on the GH1 bowls, and get some break-in time on these bad boys to see if that midrange opens up more. If it does, I think the GH1 will become my favorite of the two.
For now, I'm listening with tape on both headphones, but the GH1 is fine without.