Yep, so to clarify (you mentioned the GT as well), in order of increasing performance:
old G80 GTS (320 or 640MB)
G92 GT
G92 GTS (512MB)
GTX
Ultra
The GTX still outperforms the GT and the new GTS (slightly dodgy comparison by Toms hardware. its like saying an E6600 overclocked to 3.2 Ghz is faster than an E6850 at stock: well yes, but thats kind of missing the point!)