Full leather IMO looks far better then half leather. Well that's because I've got it

Only problem is the "sagging" leather. This only has happened to a certain number of people. Me for instance and I've changed my seat cushion five times now, but the latest one seems to be fine now

Leather does need constant care and does look shiney quickly. Autoglym leather cleaner brings it back to new quickly though

Having leather doesn't hinder seat support at all IMO. One must though is if you do have full leather you will need the heated seats. The leather gets very cold in the winter