your experience may raise controversy since many photographers believe tech camera have night and day better quality in corners compare to DF body. that's interesting.
With my Sinarback 54H I invested in a 35 HR, 60 HR and Schneider 24 XL. Than I bought a IQ 160 and DF, Phase One 28, 45, 55 LS, 80 LS, 120, 150 LS, Mamiya 300, all new. Because of the bigger image circle of the IQ 160 I could not use my glass for the Sinar p3 anymore. No one wants this glass now anymore. I have not enough money to invest into the Rodenstock 28 at the moment. So I tried out the PhaseOne 28 + DF Combo with software correction. All in all it's much better than the 22 MP files of the Sinarback, because it's just 60 MP. And I am happy not to have to do a white shading for every picture. I now have a much faster workflow. Of course the Rodenstock 28 mm is better than the PhaseOne 28 mm. I can only speak for the Rodenstock 35 HR, with has bad mustache distorsion. Not so the Phase One 28 with software correction.
For really wide views I love the Mamiya 24 mm fish eye + PTGui, because it has no light falloff and is very sharp even in the corners (at f16). You only have to do CA correction in CaptureOne.
I always liked top glass over software correction. But with 60 MP and clients with no time I am happy to come to work with the easier workflow of a complete system. It's also nice to have the focal length shown in the meta data. I don`t want to miss that any more.