The leaderboard of official submissions to the KiTS21 challenge can be found on grand-challenge.org here. A more detailed leaderboard with individual metrics and references to each team's associated paper will be published here shortly.
The leaderboard of official submissions to the KiTS19 challenge are shown below. The blue and gray diagonal lines stemming from each submission extend to the lowest-ranked team that the submission is not statistically significantly different from. A "live" leaderboard is still active on grand-challenge.org.