Is there a version on Blu Ray that you would consider to be the definitive version?
Absolutely not, unfortunately.
The new 4K transfer is notoriously one of the worst 4K discs out there, mainly due to the excessive use of DNR (digital noise reduction). Basically they wipe away all the natural film grain, leaving an unnatural looking picture. People look like wax figures. DNR is not inherently bad, all Blu-ray will use it to some extent. But when taken to the extreme it can look pretty bad.
The old Skynet Blu-ray release, also made excessive use of DNR. I think it looks pretty bad too.
So, IMO, the best looking release on home video is the 2015 Blu-ray:
https://www.blu-ray.com/movies/Terminator-2-Judgment-Day-Blu-ray/127046/
which doesn't even have a review on that site. It's the same
transfer as the Skynet edition, but without the overuse of DNR. Still, a dated transfer that leaves a lot to be desired. It also includes the extended cut (optionally). It has some good special features.
You can compare screenshots of various versions here:
https://caps-a-holic.com/c_list.php?c=4415
T2 has had such a checkered past on home video, with multiple releases on each major format. Unfortunately all the special features aren't consolidated into one definitive release.
Maybe one day.