No, I only had 3k healing. The mercy was being completely useless, pocketing a Widow while attacking the last part of Gibralter. There was so many other things fucked up about that match, though.
I feel bad when I outheal mercy as Zen (without Trance)
Trance can sometimes really pad your heal stat though
I did once have gold healing with two other healers on the team as Sombra for 80% of the match though. They overtook me at the end (it was 4 rounds of KOTH)
Not sure what was going on. I think we were just mostly rolling them and fighting on health packs