I've used Focal on both my D800 and D800E with all my lenses. The software works quite well. But the problem is that it could drive a person crazy for these reasons:
--With zoom lenses, you will get different AF Fine Tune settings at different focal lengths.
--With both zooms and primes, you will get different settings at different f stops. Most people want to test a lens wide open, but if, for example, you mostly use a 2.8 lens at f/4, then it makes sense to test it at that f stop.
After going through all this, I've come to agree with what many pundits say about the D800/e...for most landscape shooting, use a tripod and Live View.