After a lot more testing, on both 35mm digital, and DJI drone 20MP shots, I am finding that C1 has more work to do if they want to get to a level that Ptgui is at, (so I have to agree with Bernard).
Issues I am finding:
Not very good blending of sky, it misses as much as it gets a even sky.
LCC's are dropped during the creation of the pano (not sure if this is a bug or intended), both with Phase One IQ260 LCC shots and LCC's for DJI 20MP Mavic 2 Pro
No warping in process of creation of pano (something PTgui doesn't have either and I so wish they would), so work is done in CC to finish out areas not created with image detail.
No manual boundary warp option, as in LR, still love this feature
Crap shoot on even horizons, as it gets about 60% 70% of them even, but should be able to do better.
My single biggest issue is the first on, as if you get a piss poor sky blend, pretty much all bets are off on the rest of the pano.
Paul