Thank you for the help! I tried regenerating thumbnails and that didn’t seem to fix the issue.
It’s hard to tell that the images are not as sharp as the files I upload, but they are definitely not.
What’s odd is that all the other images in the post are just as sharp as they should be, it’s just the featured image that is blurry. Is there any way to mimic the behavior of all the other images in the post with the featured image?
If you look at the screenshot at the link below (view @ 100%) you can see very clearly the image at left (the featured image for the post) is blurry: