I'll give my personal opinion as a developer not responsible for hiring:
I may be wrong, but my impression working with good developers of both types (do and don't program in spare time), is that they both have good problem solving ability, but the ones who only code at work get stuck in old patterns much more. The ones that question the conventions are the ones that program outside them.
I think whether companies look at it is very mixed. I know there are not-small-sized companies that do, and ones that don't, but don't know the proportion.