OK, so I just got back from my marathon:
T1 was the remastered version we all know about, so digital, just like the Blu-ray, except for a couple sound effects that oddly didn't ring a bell.
T2 was also a digital projection, so I didn't take pictures. The same master we currently know. Problem is, on a 26 meter screen, it surely lacks definition, and the blacks were not black enough. It definitely needs a brand new remaster. Interestingly, I believe the audio was the CDS mix. Its effects, its spacialization was not the same as the Blu-ray remix, and yet it sounded familiar.
Finally, T Genisys was of course digital.