The vast majority of people are doing it for fun or learning purposes and not to compete on the leaderboard, and it wouldn't quite be fair to compare much else

The vast majority of people are doing it for fun or learning purposes and not to compete on the leaderboard, and it wouldn't quite be fair to compare much else in a competitive setting but time of completion and correctness, since you'd be at a disadvantage just by language choice in many other metrics. Unless you are someone with experience competing in competitive programming you almost certainly won't make the leaderboard anyway. If your goal is to compare solutions, lots of that happens on the subreddit for it where people post solutions in their language of choice on the daily threads. I just do it for fun. When I was younger I'd actually do them at release (11pm in my timezone), now I don't even bother and just used them as sort of a brain teaser to start my days and compare with coworkers who also do it, a lot of us in different languages.