At 18MP, the X produces clean photos at 12000ish, low light.
yes. and Sony A7s is 2500 at launch and will be below 2000 street pretty soon. ;-)
Nevertheless Sony A7s is a useless product. 4K recording only with a not-yet existing 3rd party recorder (expensive and 2 peieces of equipment to lug around). And 12 MP resoultion is just not goin' to cut it in terms of resolution for a stills FF camera in 2014.
Still looking forward to an improved A8R ... same sensor, better AF, fully electronic, 100% mechanics-free shutter with X-Sync to 1/8000s, battery charge 500+ shots and a 4k "retina" EVF ... and no video out whatsoever. ;-)