you sure have some standards, bernard
Flawless yet disappointing performances of the etudes (on CD):

Murray Perahia
Maurizio Pollini
Vladimir Ashkenazy
(disappointing partly because of all the critical hype that preceded it, and partly because to me it sounded like these pianists were fulfilling a contractual obligation to record these pieces, rather than playing them because they loved them. Meiting in another thread – maybe he was joking – confessed to hate the etudes. Maybe these three pianists have a love-hate relationship with them).
Flawed yet highly satisfying performances:

Alfred Cortot (my favourite so far)
Gyorgy Cziffra (I don’t like his etudes so much, but I keep coming back to them and smiling all along for the chances he takes and the sheer gusto of his playing)
Flawless and highly satisfying:
Claudio Arrau. (my second favourite).
Another three that I enjoy:

Earl Wide
Nelson Freire (shame on him for having recorded only Op. 25)
Martha Argerich (shame on her for not having recorded the complete set).
All the above is purely subjective personal taste – not really a matter of standards. I admire all these pianists, and if I find some of them sometimes disappointing that’s a statement about myself, not about them.

By the way, Martha has now figured in 12 out of 31 posts in a thread dealing with overrated pianists.

Best wishes,
Bernhard.