I know this is a personal preference subject to opinion, however the old font on the lockscreen clock was much more modern in feel and consistent with the rest of the software.
The new lockscreen clock looks as though it is part of a gaming phone UI, it looks less neat.
It would be great to just have the option in settings to change the font style - especially as there are already a few customisation options present.
More customisation options is never a bad thing and would definitely be easy to implement and greatly appreciated.
Old lockscreen clock style