He may well be right if you consider the cinema version could have been viewed from 50 meters from the screen and unless he saw it in 1939 chances are any cinema presentation would have been at very best a well worn print that had not been restored and remastered to the level of quality that is possible today .
While the 35mm prints will technically offer more detail than a Bluray the current standard of perfection is far higher than anything ever seen before .
On The Exorcist Bluray the director himself tells how there are details on the soundtrack that he's never heard before simply because the quality of modern video and audio restoration brings out detail that nobody ever expected to be seen or heard