Wholeheartedly agreed! I have the same TV and the exact same issue.
There is an obvious HUD in the bottom-left corner of my tv now; which, despite my best-efforts to screen-wipe, persists. It's gotten less noticeable after several hours of wiping, but still clearly there whenever it's against a light background. More gameplay will just potentially make it worse over time.
An opacity option here would go a long way as sessions in Destiny tend to last for a few hours.
Great game, needs HUD opacity option. Please.