Interstellar 9/10
Maybe I'm scoring it a bit higher because it has been a long time since I've seen actual moving pictures with all the film grain and not a pixel in sight, accompanied by the gentle flicker of the projector. (Although the bright sky could also be compared with a strobe light at IMAX size)
Most of the movie is shot in 35mm with more of the 70mm source material near the end. It's a bit jarring at first, all the transitions between soft picture with black bars, to full screen with razor sharp detail. Not that the 35mm material isn't a clear step up from 2K digital, it's that the 70mm stuff looks so good it literally gave me goosebumps a few times. Can't wait to upgrade my home theater to 4K, then 8K :)
The theater itself, Coliseum Mississauga IMAX 7/10. Black level compromised by the red glow from the exit signs and light bleeding out of the projection booth. Sound level at times so high my ears started clipping (They're still ringing now) Wall to wall screen, really theaters need to be larger then the screen for the sound to breathe and the picture not to brighten up the walls. Surround sound was decent, yet I was seated against the back wall so no sound from behind. There were only 10 rows of seats, small IMAX theater. Seats, not all that comfortable.
The movie itself. Awesome. Although earlier 'twists' are quite predictable, the final twist is a great one, very fitting, and beautifully visualized. I would also have liked to see them explore a bit more than Iceland and Water world, although they both look great. (Btw why does that magic wave not break in the shallow water...) Still there was plenty of space travel during the movie to make me happy. The gravity inspired bit was actually more exciting than the whole of Gravity, yet also took a lot of shortcuts with the laws of physics.
It might get a bit cheesy at the end, I don't mind, Nolan managed to get my eyes to tear up anyway. I didn't want it to end, kinda disappointed when the credits started. (Btw why is it always as if someone yelled fire as soon as the credits start...)
Long story short, I enjoyed from start to finish, definite buy on blu-ray / 4K blu-ray. It won't be the same though with black bars coming in from the side instead of the screen opening up for the 70mm parts. Great acting, great score. (Can't wait to hear it without distortion)