I'm going to print that as poster sized image for my wall. With the super res image I can get a 3 foot by 2 foot image printed with 222 dots per inch. Can't do that with a 20 MP image.
You can get a better print from fewer, larger, quality pixels than you can from more, poor quality pixels. Also, as I said earlier, a quick run through easily accessible up-res software (Photoshop, Topaz GP, etc.) will have that 20MP image looking better at 48MP than a 48MP image stitched from four tiny 1/2.3" sensor 12MP images. It's the same reason a print from a 16MP DSLR can be made to look much better than a print from a 28MP smartphone, for example. Megapixels are only one part of the equation - there are so many other things that make a big difference such as file malleability, lens quality, noise, diffraction (which is already a problem for the
M2Z at F3.8, which is the aperture at 48mm where the Zoom takes it's SR photos). Viewing distance is also a major consideration, as is the print medium - some are far more forgiving than others.
Also you can stitch the same 20MP images from the
M2P if you wish, which is extremely easy to do manually and would also yield an even better result than either of the above options. The drone just doesn't do it for you, but external software is better at stitching anyhow.