Im hoping to have an 11s2 (worlds first DC4 machine
I still await an answer) and will be able to compare to the RS2 directly with state of the art test equipment.
Having tested the 15s1 back to back with the RS2, i felt that the 15s1 was clearly the better machine. The 8 test viewers voted 6/2 in favor of the 15 in blind testing. The main factor was sharpness, with the RS2 being a noticeably soft image. On actual bench test the differences were readily apparent
I dont expect the 11 (from a couple of reports) to be much of an improvement over the 15 but incrementally better.