if u ask me,
I would get S5pro anytime of the day.
Provided u can live with the speed.
Not only colour, but DR, noise characteristic, and ability to recover amazing highlights are the strength of S5pro.
In many respect D300 and D3 is a leap ahead of the D200/D2x but they still cannot touch the DR and highlight recover ability.
I lost the link but a person who owns both D300 and S5pro puts out the raw and tried pulling -2 and u could see due to the implementation of the curve the D300 lost all the data while S5 managed to salvage all the sky without abrupt white.
Then again, not many people appreciate this aspect of the image and most are just concerned with high iso noise(which IMO is never really a problem for digital compared to film) and speed all that, very technical. S5 is never meant to compete in mainstream market in the first place, anyway so it's kinda wrong to compare the technicalities. It's for those who want to shoot digital 'film'