Not all. Try shooting a few shots and zoom in to check for sharpness. If u can, bring along a focus chart but I din do so as I felt I have the warranty so it's ok. I'd take caution to shoot at a moderate iso and higher shutter speed (if u don't want to mount a tripod in the shop to test shoot.). Then I'd try certain aperture I use often, eg 1.4, 1.8, 2.2, 2.8, 4, 5.6, 7.1.
Still sourcing for a better price, if there is any