Top 25% doesn't sound all that great given how many are totally incapable of running a mile in any time. I once looked up my swimming pace for a typical workout (15min x 5km). That's well within the top 0.1%. Navy SEALs dont swim that well. But given that probably less than 1% of the general population swim any laps regularly, it isnt saying much.

Fyi, if you want to feel good about your swimming, lookup the youtube vids of the navy seals swimming standards. I know 12yo kids who could pass them. Their pace wouldnt even qualify for the 'fast' lane at my local lap pool (50m/minute).