Here is my usual low-contrast distant subject test scene as seen by the RX-1:
I did a series of tests with both the RX-1 and the NEX-7/24mm f/1.8 at f/2, f/2.8, f/4, f/5.6, f/8, and f/11. I looked at the center part of the image first.
I’m putting up 1:1 jpegs, but the best way for you to look at the images is to download this file, which unzips to a .psd (Photoshop format ) file with 12 layers. The top six are the NEX-7 images, with numerically increasing f-stops from top to bottom. The bottom six are the RX-1 images, with numerically increasing f-stops from top to bottom. You can choose whatever magnification you want, and compare whatever layers you want by clicking on the eyeball icons.
At f/2, there’s not much difference, but I’d give the nod to the RX-1:
There’s a substantial improvement in both cameras at f/2.8, with the RX-1 picking up a lot of microcontrast:
The NEX-7 continues to improve at f/4, but the RX-1 is about the same. I’d call the NEX-7 the winner here, but it’s close:
The NEX-7 loses a little contrast at f/5.6, and the RX-1 gains a bit, leaving the RX-1 slightly ahead:
Diffraction takes its toll on both cameras at f/8, with the NEX-7 suffering a bit more:
The NEX-7 is much worse at f/11 than at f/8, with the RX-1 suffering less. The RX-1 image is not bad at all. This resistance to diffraction softening is a consequence of the larger sensor size:
Except for the diffraction limited performance at f/11, these images are pretty close in quality: