Dear all

I came across a rather nice looking FG and couldn´t resist. Now it´s here and I have a problem :
The first thing I did, was checking the exposure meter and focussing against my trusty F2s´. The
exposure meter seems to work alright but the focussing is constantly short i.e. F2 1.2meter - FG 0.8m
F2 4m - FG 3.5m, and so on up to infinity. Focussing is short on all lenses. My question now is :
How big is the chance that pictures will be out of focus when something like that happens ?
Is it worth a few test shots or shell I return the camera (which I can) and not bother further ?

Jörg