Blade runner was shot on 65mm and was scanned at 8k for the blu ray release. until epic came along film was the highest resolution you could get and with 65mm its still 8 to 9k as is imax.
Blade Runner production footage was shot on anamorphic 35mm. Only the visual effects utilized 65mm, a common technique at the time for large budget visual effects laden pictures (still used on occasion for this purpose, as is Vista Vision).