I was going to start gathering the strength of schedule and composite talent rankings for the SEC and the Big 12 for the last ten years, but after ten minutes of annoyingly obvious research showing that the SEC routinely had 8-9 teams with Top 25 schedules, and 7 teams with top 25 talent (versus only 3 in the Big 12, with rest being routinely ranked out of the top 40 in player talent), it just got boring as hell. Oh sure, Texas, OU, and TCU were always ranked somewhere in there (though mostly Oklahoma, and only recently Texas) but you had to get into the 40s to find the rest of their teams. The 40s. That's well past even the Kentuckys and the South Carolinas over in the SEC.
Anyone trying to say the modern era of the Big 12 is in any way comparable to the SEC, at either the top or the middle, is kidding themselves. It's not.