The N801/F801 have a primitive AF when compared to the F80 but it is very plasticky when compared to the 801. Altogether the 801 wins hands down in built quality.
Having said that the 801 is no slouch when it comes to focussing. If you use a tripod the F80 uses a normal cable release where the 801 needs either an MR3 adapter to take a cable release or a special electronic release.
The big question is - the 801 is getting a bit long in the tooth now and good ones will be getting harder to find whilst the F80 is at the opposite end of the spectrum where availability is concerned.