Anyone have some landscape time with both the A7/R/35 and RX1/R?

I would appreciate any feedback on the field differences in corner shading and color shift in the f5.6-8 range!

I am using an A7 currently with the 35/2.8 for landscapes. Loving the combo for most things, but getting frustrated with a percentage of the landscape shots (blue sky, unbroken snow fields).