I think you've got a few wires crossed, O Freaky one. While it's true that VFX is usually done at 2K and then upscaled to 4K - that's not just Sony but the industry in general - the two Amazing Spider-Man movies were shot on 5K RED and 35mm anamorphic respectively and were definitely finished at 4K. Skyfall was indeed lensed on the Alexa, but 2.8K upscaled to 4K is better than nothing and, as mentioned, it held up brilliantly on giant IMAX screens thanks to the Alexa's excellent dynamic range. Resolution ain't everything...
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