I know this is not the question, but as a side sleeper, I think a quilt is more comfortable and it works better in a hammock if you are headed in that direction.
As a side sleeper, the problem I have with mummy sleeping bags is when it is really cold and I want to close up the hood I am always fighting with the nose hole and I have been doing that for about 30 years. For me to get comfortable I have to turn the entire bag which is a real PIA, whereas with a quilt, I can turn under it easier.
I am a real flip flopper.
Ideally a good quilt for me would be one with an extended
curved hood type section at the top to pull over my head. Then I can scrunch up a small breathing hole to the side. I can do it with a normal quilt, but it would be easier with an extended hood type area.
That said if you leave your head hanging out of a sleeping bag and use an insulated hood it does not really matter and you can turn inside a sleeping bag.
The most comfortable sleeping bags I have used are the Montbell SS series. They have 100% honest ratings IMO.
If you are 5-11 or 6-0, get the long.
Very comfortable, very stretchy, and big enough to use as an outer bag over a quilt or another slim mummy sleeping bag.