I don't understand the term "MFF".
The NG has RNP AR curved approach capability. Is GLS the same as GBAS as described in the FCTM?
For what it is worth, the 737 NG in terms of avionics and capability seems to be very sophisticated. A chat with my 777 buddy suggests some additional features over its bigger brother. It can take off and land pretty much anywhere.
Electronic normal checklists would be a big imovement. But not for non-normals, I would prefer to remain the conductor.
As regards space on the flight deck, I only know the 737. As we are stuck in our seats for the duration and those seats are comfy then no specific complaints so far. Happy in my ignorance!
Flight deck noise and ventilation are the issue they really should deal with. I don't care if it has old fashioned panels of switches and knobs, but I want to spend ten hours in the thing without requiring an ANR headset in the cruise and being able to control the temperature, not to mention those aft FD ducts!