The IQ did actually improve. It is sharper and more detailed. You can't really compare anything in the foreground, because the camera angles are too different, but you can compare the backgrounds:
old:
new:
The trees have more clarity, their stems are visible as fine lines instead of thick blurry ones.
old:
new:
The mountain outline is sharper, the snow fields on the mountain are clearer and less blurry as well.
If the changes aren't really apparent to you, you need to overlay the two images and switch back and forth, then there is a clear improvement visible.