Some years ago, they released the TODD-AO version on laser, and it was a revelation. The TODD-AO version was apparently filmed in the mornings, and the Cinemascope version, which we usually see everywhere, as well as on video, was filmed in the afternoons.
But, different shots and camera set-ups were used for the TODD-AO version, and it seems like a different movie! Fresher, more vibrant, somehow more interactive. Even had a different opening, with an overture.
Then, with the advent of DVD, I understand the TODD-AO version got set aside, so that it's once more the Cinemascope version we see.
It seems to me there WAS a dvd release that contained both versions of OKLAHOMA, but the Todd-AO version was, for some reason, a mucked-up transfer that looked worse than the standard CinemaScope version.