One of the area's hit the hardest that we've seen is the 4K write performance. When we first found the issue it was the 4K QD1 write speed that we noticed at first.
This benchmark is about to go away and be replaced with a new real-world test.
The scale is different on these charts as well.
Crystal Disk Mark
The harder we work the drives the lower the 5.0.2 goes, but with TRIM, the 5.0.3 is able to quickly recover on its own.