One thing is very necessary (not only) for me while comparing two file pairs:
when you have 2 files which are identical but the time is not then you will get a question what to do -> not good in my opinion
better is when there is the (optional) possibility to generate a hash sum of both files and compare this hash against each other and only when this didn't match ask the user!
I know that this would slow down the speed but I need it (and I believe I'm not alone).. So the next thing would be to generate hashes up to a user specified filesize only. Reason: to avoid that very big files would be slow down the speed extremely.
When a hashsum feature is implemented as an optional feature it wouldn't affect all users but only those like me that want to use this feature..
Would be great to hear something from you..
Regards
Jogarem