Can you share what you use to stitch images?
I have used Arcsoft Panorama Maker (Pro version, allows for 100% size in stitching)
I have also used Microsoft ICE 1.4 (32-bit version), but it is easily maxed out and displays MEMORY FULL just by a stitch of three frames from a Z7
The 64-bit version of Microsoft ICE (v.2.03) handles memory better...
I have also used Hugin (both 32-bit and 64-bit), very powerful and Free
Some cameras have the stitching included in the options, like most current smartphones. In the Nikon world this includes most of the 1 Series Nikons
Sometimes it's a useful feature, you get to see the results immediately on the LCD. You can rotate the camera in any direction, and you can also keep the camera in portrait mode and have a higher vertical resolution (like John Geerts a few posts ago). In that case the photo will appear vertical and you have to rotate it in Post-production, not a big deal anyway.
An example with Nikon 1J5, recent Mayor election-day in my hometown (original is 4800x920 px):
[if I had used the 1J5 in portrait mode, vertical resolution would have increased to 1536 px --> 4800 x 1536]
Very nice for a walkaround camera!
Ciao from Massimo