I’m coming from the first generation watch and I feel the colors aren’t as vivid on the series 4. Also even with full brightness it doesn’t seem super bright. Just me? The colors look so much better setting up watchfaces on my X then the watch.
Its due to the reflectivity Being slightly shuttered due to the sapphire display. There was a nice comparison chart showing the differences between the brightness on the Ion- X Glass versus sapphire, and the Ion-C Glass is increasingly brighter with the first GEN watch. However, since the Series 2, Apple has increased Apple Watch display from 450 Nits to 1000 Nit brightness , which to me, has rectified any concerns.Did you move from an aluminum watch to a stainless steel one? The sapphire crystal on the stainless steel watch isn’t quite as clear as the glass on the aluminum watch and can mute the colors slightly. I don’t really find it noticeable in regular use, but if you compare two watches side by side you can see a difference.