It is so bizzare... Why do you even compare render outputs? You will never be able to match the glossy materials correctly, and even so the differences are too small. If some renderer has a decent gallery of high-quality pictures, then one can assume, that it is able to produce high-quality results, and then it is just a matter of ease and speed with which you can create such renders. And this is mostly subjective...
Because it's fun: D and I, Ecximer and another some people defend The Corona...it's just a GAME