With the proliferation of high performance planes like Yaks, Extras, Sbach's you can definately tell the difference if you can so much as fly knife edge or do a snap roll.

Any intermeidate helicopter pilot can tell the difference.

Any competition pilot can tell the difference.

If you fly a platform like that enough to get familiar with it, then install decent digital servos, a good percentage of the pilots will be able to tell the difference.

Putting in circles in a cub, probably not so much.