They do look over processed. Like they have had some pseudo HDR process done on them and then a heavy noise reduction applied.
Are you shooting raw and what processing are you doing to them?
First one has exif which says auto exposure and f22. Not the cause of the problem but f22 may make things look softer. Try Aperture priority or manual at around f11 f13 for landscapes.
I find this interesting. I like both images very much, and I agree that they have an HDRish look about them. The exposure is almost too good both on foreground and the sky, without any real shadows.
I am intrigued by Robert's critique. What makes you pick up on 'pseudo HDR' and 'heavy noise reduction'? I ask, of course, because I do one, and increasingly the other, quite often, and whilst I am not sure that my images look like these, I am curious to know what distinguishes them as such!