I agree with most of what the others say I don't think it'll make much of a difference. I have a Rolleiflex TLR with a Planar lens with many fine scratches on the front, it produces such a beautiful moderate contrast versus my Xenotar Rolleiflex and my other Planar one with no scratches and I often prefer it's images over both of those! Go figure.
Based on experience, I'll take a lens with one or two bag gouges over a lens with many fine scratches. It's a lot easier to reduce the contrast of a good lens than to improve the contrast of a trashed lens.