I have the Gemme Katana 2s and played them with a Bryston 2BPro and was not impressed with this amp. It had enough juice (so to speak), but nothing special. I also tried them with a EL34 based tube amp - again, wasn't overly impressed with total performance. Tried them with a Pass Labs Aleph 5 (60@8/90 watts at 4 ohms), again, same general feeling.
I like these speakers and feel that they are fairly forgiving. My biggest complaint is the sound stage being neither deep or virtually nothing forward of the speaker plane. I normally run Wilson W/P speakers as my main speakers, but move the Gemme's in and out from time to time.
I now have a Levinson 334 and am planning on running the Gemme's this coming weekend to see if their sound stage improves with this amp (which has better soundstage performance than the other amps I ran these speakers with). FWIW, my room is treated at various locations with Real Traps. My speakers faces are 4 feet out from the wall. My other components vary at times but include: ARC LS16 MK 11 preamp, Levinson 390S CD/DAC and sometimes direct to amp, Esoteric SA-50 CD/DAC and sometimes direct to amp and of course a server based system (running into the DACs of the aforementioned CDPs).
I love the Gemme speakers, but am still trying to find the right amp to improve the soundstage, which is very good laterally and moderately deep (not deep enough with the abover referenced amps), but nothing forward of the speakers. I like a detailed, but not grainy sound over a warm/lush/bloated/loose sound.