This one can scan. The 5050 cannot copy

No, it can also copy and scan

The GX4050 can copy and print. It even has an automatic sheet feeder. In my opinion, it's a great device,

Copies are possible. Only when copying/scanning double-sided do you have to reverse the stack and have it copied again. The printer will then put the copies/scans in the correct order.

This is a multifunction printer! As the name suggests, this device can, among other things, make copies (print)

He can copy, I have just made a copy.

Of course, this versatile printer can also make copies.