These are Quest's older r2. I think the newer production r2's sound cleaner. (As I've been saying again and again, the newer production r2s with the bamboo wood are great and really close to the LCD3.)
D2 is great. D3/4/5, I would have thought it be better, but the measurements are according to what I hear. I think folks would have freaked out about how excellent these bass figures were a year ago, but HiFiMans are in generally cleaner in the bass.