It seems the 2.6 Ghz Nokia Lumia 1520 is slightly better tuned that the 2.5 Ghz Samsung Galaxy S5, if we believe the benchmarking of Rightware.com, who found the handset narrowly pipped the Samsung handset to the post, taking first place ahead of all other Android and iOS handsets tested.
In their more comprehensive test, which is designed for measuring overall performance of smartphones and tablets from all platforms, the handset still scored well, taking 5th place overall.
The full BenchmarkOS test is a comprehensive suite of tests and produces an objective overall score as well as a breakdown of each tested area, including system, internal and external memory, graphics, web browsing, camera, battery and CPU consumption.
Of course all these benchmarks are useless without the games, but given the increasing number of cross-platform tools now supported on Windows Phone this will continue to be less and less of an issue in the future, and if you have a new, high-end Windows phone, you should also be assured the game will run as well as any other handset on your device.
See the scores at Rightware.com here.