I did these tests about mid april with my a7 and leica 24 3.8 to see whether i could live with the soft corners for my landscape work which is predominantly shot while multi day backpacking (hence the desire for a small kit).
The leica i still have, but the a7 is up for sale as i am happy with the sony platform for this application, but want to get the a7rii when the price becomes a bit more realistic.
Just some info on the testing for the 5 street scene images. The camera was on a tripod, using a cable release. The lens adaptor is a voigtlander VMII. I just set the focus as per the indicators on the lens at f11. There are other images that i took where i manually focused using the focus magnification through the efv at the bottom centre and upper left of the image, however these 5 images worked out to be more accurate for the test. I processed them through C1 using an LCC and them sent them out as tiff files with the std C1 sharpening. I then pulled them into CS enlarged them to 100cm and gave them a final USM of 150;1.2;0. These are the 100% views. I often print to 100cm so the viewing distance would be about a meter.
I eventually settled on a point about 1.8-2m as being the ideal focus point to get the best corners and good sharpness throughout. 3m is better for the central point, however with the USM on the 2m image i don't think it would be to noticeable on a print. (i have not printed these, just pixel peeped on the screen so am not sure if the sharpening has been to aggressive)
I also tested using helicon focus and took three of the different focus points and stacked them that result was also quit good.
The setup for the image of the tent and mountains was exactly the same as above and the lens was taped at 2m and f11 to stop accidental shifting. Process was the same, however in C1, i added sharpness falloff of 150% to one of the images and not to the other to see the difference.
I know that some might see this is being a bit ocd, and that soft corners dont really matter. However, I have always shot my scenic work with the intent of getting the whole image sharp. The images that i got from my pentax 67ii where always exceptional, and this is what i would like to see from a small camera package like this.
So are these acceptable corners at f11 without the kolari mod? Ultimately, I want to get the A7Rii and i wonder if using a similar set up i would get a similar result. I dont usually shoot below f11 for the scenic work but sometimes with my canon and wa lenses I do shoot open and try to throw the focus.