My ST7 is NABG - and I realise that accounts for a lot.
You're right, I'm comparing chickens and ducks. I'm not saying the QHY is bad in any way - I'm just saying wouldn't it be nice to be able to combine chickens and ducks and end up with a chickduck

A high QE colour ABG camera
So the QHY is AU$2500 ? Wow, nice.