It has the same sensor, so your "advantages/disadvantages in tests" are just your own measurement errors, well within your margin of error (see your comparison of Fuji X10 and Fuji X-S1, Oly E-M5 and Oly E-PM2 - sensors and processors are the same, your ISO scores differ by 10-20%).
But P7700 has slower lens, chosen to be slower to provide longer zoom range. So the choice is do you want better 28-112 (XZ-2) or better 130-200 (P7700) for which you don't need to crop (113-120 or even more I guess as good or better on Oly even with a little crop due to faster lens at 112).