It must be 50 years since I saw the film on the big screen, having seen it many times since on TV. I'm not sure the '4k' restoration made much difference on the cinema screen last night – other than to emphasise how much better special effects are today; the castle above the Eder, for example, was wobbling a fair amount, something I've never noticed watching the film on TV. And the Canberra at Hemswell was easier to spot last night in my local Odeon, as was the 'black canine ghost' in the final scene.
Restored or not, it's still one of the best war films ever made, and never fails to make me well up at certain points.