35mm film comes out to about the same sharpness as a 1.5k CG image. Even with the best lenses and scanning, 35mm scanned at any resolution still doesn't get sharper than a crisp 1.5k upscaled to be at the same resolution. Even middle of the road RED cameras have exceeded large format film in their sharpness and sensitivity.

Not really. I watched "Star Trek II" and "Ronin" on HDTV and found it painful. The sets on STII looked cheap and the uniforms looked like costumes. "Ronin" looked like a soap opera. I found it hard to watch old movies on HD.

Not quite. They once did a measurement of the effective resolution of actual analog movie theaters (sometime in the 2000’s IIRC), and the result was in the ballpark of 720p, so halfway between (anamorphic) DVD and Blu-ray.