Is that the only printer you have? Your 3880 would be good for proofs but the real reason for a GFX 100 is to print big. Maybe 30x40 0r 40x60.
11,648x8736 gives you a 32x24" print at 360.
11,648x8736 gives you a 16x12 image at 720.
In Lightroom if left at native resolution your 16x12 print will be 720.