I don't have any Classic pressings of LZII, but the Classic 45 of LZ 1 is an impressive listen; the Classic 33's of 1 and III are very good, though I still prefer the older Piros/Monarch remaster of LZ1 to the Classic 33 of that album.
I did break down and buy a first UK of LZIII (early, with the Peter Grant credit), so I'll be able to do a comparo of the new record against a Classic (33) of III and the UK first pretty soon.
I guess for ZoSo, et al, we'll just have to wait and see.
Fremer's review of LZII is online, if any of you are interested.