I say no impact, however, to prove definitively you will need a mint version of the same lens shot indentical settings....not like you could do that, so how will we know? I doubt it will have a streak across the neg, so how will it be shown to be good/bad when one could argue low contrast was due to your film stock, agitation, dev.....etc, etc....? Ok I am overthinking it...so in short - no impact