4K is more than just pixel resolution.

It also comes with a significantly bigger colour gamut (Rec.2020) that will capture more lifelike colours. And those colours will (hopefully) be delivered at a higher bitrate and lower compression than the 8bit 4:2:0 encoding currently used on blu-ray. This may have a bigger impact on image quality than the resolution...

I may be wrong, but I think 35mm film resolves to around 4K+ resolution, so with 4K digital we can almost make transparent digital copies of the best 35mm film masters...

I'm also in no rush to rebuy my collection, having done it so many times already. I'll probably just buy unseen films and a few select legacy titles.

But I want 4K at home NOW! But *then* I think I'm done... no 8K for me...