I specifically take an interest in the flower differences. Note how left is palest (Legendary collection) with it becoming more yellowish to red and then brown.
The shadowless cards are both rather dark but not the same.
The green of the cards is also different each time with first edition being the lightest this time.
Saturation on most all WOTC cards are going to be all over the place. I would agree though that some look better than others if someone is specifically looking for that. I myself enjoy the deeper reds, yellows, etc.