I like the vignette a lot. I almost always add some vignette in my raw processing, especially for portraits and location work. It helps frame the photo and place visual emphasis on the subject. (Back in the last millennium we used to do something called "burning the corners." Ah, the memories.)
For landscapes and stitching, of course, the vignetting is a pain in the neck. But it's usually removable in processing, and you won't see it at f/8 or f/11 anyway.
BTW I am a big fan of the 24/1.4, but only when shot wide open or close to it. If you're shooting at f/8, there's no reason to carry it or spend all that money. I also like the 28/1.8, with the same proviso.