Maybe I do. I consider myself to have average vision but I don't actually know what average is and I have never had my vision tested as such. I doubt it, I know what 5K should well be able to resolve and that seemed just about right for the screen. It was very good but not good enough.

The 70mm I saw was material shot on 65mm. No blowups.

You really are desperate for my experience of film as superior to be invalid.

Alright, lookie this here, proof!
http://www.smashboxdigital.com/wp-content/uploads/2012/02/SBD-TEAM.C009_C017_072848.0000585_5120-PIX.jpg
5K frame out of the very same kind of camera. I found a bunch of others and this frame is sharper than the average. And even on the sharpest bit near the middle guys teeth it's visibly lacking in definition. In fact, this is exactly what I saw in The Hobbit.
It's a very good image but it's not comparable to what I saw in 2001.