Apple & Google are Only Vendors NOT Gaming Benchmarks
According to Anandtech, the only folks not gaming benchmarks on their smartphones and tablets are Apple and Google/Motorola (with Nexus and Motorola devices). Even the Google Play Edition phones are tainted with the benchmark gaming because of vendor software.
So if you have ever wondered why an Apple, Nexus, or Motorola device might have performed better than a phone which had better benchmarks, now you know why.
NOTE: No mention of Microsoft/Nokia in Anandtech article. I don't think he has tested this.
UPDATE: As Cloudgazer points out, Sony is not mentioned in the Anandtech article and may not be guilty of benchmark gaming either.