I have a Yamaha U3 upright i bought last year. Before it, i had an old German piano so you can just imagine the difference...
I played so much on my U3. Of course, it has a very professional touch, so it is so easy to get the sound and dynamics you want. When i go to the lesson, i play on a much less quality piano, which require some extra effort and concentration from you to get the right sounds.
I feel my touch at the piano at the lesson has become so poor and so unsensitive. My teacher tells me that too. I don't know but i am afraid it has to do with my continuous playing on the U3, so i got used to its easy touch so that i find difficulty to play on other pianos.