can anyone here compare gfx and x- images? not interested in anything to do with specs other than dynamic range and low light. i've become fascinated with pushing cameras in low light/high shutter speed (x- series) and would like to play with gfx, either 50s or 50s ii, with the gf 45 2.8 lens. might rent and go on a trip, but would like to gather more insight in the meantime.
recently, i've been playing with the xf 18 1.4, and finally i can shoot in my dipshit apartment and not worry about lighting.

also, i've wondered for years about how important pixel size is; it seems a bigger pixel size vs more pixels would suit tough lighting conditions, but as tech advances, smaller pixels can keep up with older larger pixels. anyone know where i can read more about this? i'm not sure what question to ask. maybe i should be researching the sensors in question.
upon lazy googling i don't see much reviewing on the 50s other than pre-production and spec reading. would like to find comparisons.