Easy, let's not get too carried away! If you already own the Ultimate Edition DVD of Dr No & have watched it upscaled to 1080p, then IMHO you'll not notice much improvement in this Blu-ray disc (BD) version.
Indeed, the often quoted, "The film now looks like it was set in the '60s rather than made in it...", is actually taken from a promo documentary for the remastered 007 Ultimate Edition DVD series (2006); the 007 BDs are sourced from the same restored master tapes.
Compared to the Ultimate Edition DVD, the Dr No BD has slightly richer colours; a bit more detail in faces, clothing material etc; & slightly more depth of field. Also, those with surround sound will be disappointed that the majority of the soundtrack still emanates from the centre speaker. And it's a shame that the car chases & fight scenes are still sped up.
However, if your existing version is the DVD prior to the Ultimate Edition - then you WILL notice a big difference.
If you do want to see/hear a marked improvement from DVD to BD, may I suggest that you checkout the Matrix, Blade Runner or even Casino Royale?