The Q has more room than ATR as is a 56seat cabin with 50 seats in it. Agree the ATR cabin is getting pretty tired.
Do a bit down the back at times and would have to say the ATR is quietier, and with out noise cancelling in the cabin walls.
I hear that by buying the 7 they don't already own they will be looking at putting the new ATR cabins in designed for the 600 in the coming year.
Will be interesting. Would seem the company more than happy to wait and see what is being offered in the 90seat bracket in 4-5years.