If you want a 7X57, get one by all means. I like them. Comparing what you want to other cartridges is always pointless in my opinion. 7-08 will do this, .284 Winchester will do that, .280 Rem will do such and such, 7Rem mag, 7 WBY, and the next thing you know we will be needing a 7Rum to kill a squirrel.
If you like the Mauser, get it.