Yeah, I have a dual 24" 1440p monitor setup. One monitor is the Dell S2417DG 144Hz monitor and the other is an Acer IPS 60Hz monitor.
When both monitors are just displaying the desktop it's easy to see the difference between the two because they are sitting side-by-side displaying the same background image. The color just looks better on the IPS screen. I did calibrate the Dell TN monitor to the point where it looks good to me but there is nothing I can do that will make them match.
I certainly wouldn't recommend this Dell G-Sync monitor to someone who edits images for a living or simply cares about perfect color. That being said I think that Dell is a great gaming monitor. When I'm not looking at a side by side copy of the same...