Go out and take some pictures and enjoy it
FYI: My first 5D III had a faint vertical line that was visible on solid backgrounds. I first noticed it, in the blue sky, while photographing some birds. I later photographed other solid backgrounds and the line was consistently visible, so I exchanged it for another.
You might also try some high ISO shots on a dark background to see how many bright red or blue pixels you have and see if there are any large clusters. I expect you will find stuck pixels on most cameras, especially at high ISO, but if it looks like your camera has the measles or there are large clusters, then you might want to exchange it.