I don't see how that's possible. I decided to give GPT-4o a second chance after reaching my daily use on Sonnet 3.5, after 10 prompts GTP-4o failed to give me what Claude did in a single prompt (game-related programming). And with fragments and projects on top of that, the UX is miles ahead of anything OpenAI offers right now.
GPT-4o being only 7 ELO above GPT-4o-mini suggests this is measuring something a lot different than "capabilities".
Anecdata seems quite valid for LLM comparison when trying to evaluate 'usefullness' for users. The lmsys chat leaderboard is literally just mass anecdata.
Yes, "mass anecdata" + blind collection is usually called "data".