Here‘s a link to the layered psd file with all the images in this post. As before, I recommend that you look at it if you wish to form your own judgements about these images.
At f/2 in the upper right corner, the NEX-7 is substantially sharper, but has lower contrast:
Both cameras pick up sharpness as we move to f/2.8, with the NEX-7 remaining ahead:
It’s pretty much a wash at f/4:
There’s a big improvement in the RX-1 at f/5.6, with the NEX-7 staying about the same. The RX-1 is now delivering substantially superior performance:
At f/8, the NEX-7 is about the same as at f/5.6. So is the RX-1:
At f/11, the NEX-7 is getting mushy. The RX-1 is softening, too, but not nearly as badly:
It’s interesting that the two worst images in the series, the NEX-7 at f/11 and the RX-1 at f/2, offer about the same image quality. Could the RX-1’s soft corners wide open be caused by field curvature? Possibly. If I get the time, I’ll run a test.
My take is that the RX-1 offers better image quality than the NEX-7 at the apertures you’re likely to use most – a couple of stops to four stops down from wide open – but that the differences, while consequential, aren’t striking until you get past f/8.