Some of it just just personal preference and it depends on the bar being set by a particular individual. There's no set standard. But here are my two pastels.

First up is my female pastel. I'd rate her an A++, she's simply the brightest adult pastel I've seen. She's held her color remarkably well. Interesting thing with her is that she wasn't the best or brightest hatchling, but she did look nice. However her first year she actually got brighter and hasn't changed much. I really lucked out with her! (she's really this light and bright in person!)



Next up is my male pastel. He's browned out some. He's nicer than some I've seen, but not as nice as others. I'd rate him in the middle of the pack as far as quality. Maybe B or B-?