You've mentioned the Finch, Morley and Wilde films but there is also a very good 1980s TV film with Michael Gambon called 'Oscar'. I didn't think that the Fry film whitewashed why Wilde was sent to prison in any way, and I'm surprised that after it Stephen Fry didn't go on to perform in other serious roles. He was surprisingly good and convincing.
The Finch film though is the best of all, IMO. It shows his range and that of Lionel Jeffries.