I don't think anyone said the new Blu-ray had correct colors. However you can't say the original is correct either. Again, it looks too video and not film. The red looks tacked on (see DeNiro scarf in the first pic, it looks photoshoped onto the image). Both transfers are botched, and if you're happy with the original Blu-disc, I guess you will accept any original film to have it's color sheme destroyed (as Mad Max 2 for example was) as long as the fleshtones are natural and there is additional picture detail.
There is a tint on the new disc. It may not be the correct tint as intended, but the film had originaly a tint and is not supposed to look naturalistic with clear blu skies. It's the same thing as You Only Live Twice where the original UE removed the style and made the film look "natural", when it was never supposed to be that way. The new disc may be bad, but at least, it look stylised. All Leone filmed are visually stylised. They're not supposed to look like they would do if you went to the same locations to take some snapshots with your iPhone.
The cemetery comparison pretty much sums it. All the style is gone on the original disc.
However, I CAN say the original Warners Blu-ray is correct, color-wise, because - it is. Whether the disc looks like video or film is irrelevant to its color. You seem to just ignore my points - the main one of which is that I know this film like the back of my hand, saw it MANY times during its original release in both long and short versions, and owned a gorgeous 35mm LPP (low-fade) print of it which had color like the Warners Blu-ray in the caps above. Please tell us your experience with this film - how many times did you see it during its original release. How many times on video (aside from the VHS trailer)? With all due respect, you keep making posts that aren't based on anything other than what you "think" this film is supposed to look like. What was stylized in this film was the look of the footage from the PAST, not the present. The present had all its colors just as they are in the caps from the Warners Blu-ray. The childhood sequences were designed in browns - just look at the buildings and the costumes. But the photography always had bold reds and golds. The scene of Deborah dancing is completely colorless in the new version - in the original it's brownish because that's the design, but has a color scale within that. There is no sky in any Leone film that is green, sorry. Sky is blue or, if cloudy, cloudy and blue, or, if gray, gray, but green? No. Leone was stylish, yes, but he was very color specific. He had that fire engine painted RED not brown/orange. That was the point in that scene - for the fire engine's red to stand out, and the blood on the pavement, too.
We're just going around in circles. There is no opinion involved in my posts, just fact. Yours are all based on your personal thoughts and, seemingly, wants. The caps above tell the entire story and it should be obvious to anyone which color is right.