Steve
Retired Administrator
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My personal, non scientific, review.
I had a 18-135 zoom lens on my camera and wasn't looking for bird shots when somebody said eagle.
There he was a bald eagle flying by so I took the shot at 135mm:

I cropped and saved it to the size shown.
I enlarged the crop from 692 X 508px to 9000X6607px in Photoshop and then with Perfect Size 7.
I placed them side by side with the original crop, here's the result.

I hope you can see what I see, Perfect Size 7 really outshines PS when up sizing an image.
I had a 18-135 zoom lens on my camera and wasn't looking for bird shots when somebody said eagle.
There he was a bald eagle flying by so I took the shot at 135mm:

I cropped and saved it to the size shown.
I enlarged the crop from 692 X 508px to 9000X6607px in Photoshop and then with Perfect Size 7.
I placed them side by side with the original crop, here's the result.

I hope you can see what I see, Perfect Size 7 really outshines PS when up sizing an image.