Firstly, a not very scientific suggestion, but as an approximate measure how about comparing the number of pages in their published language specifications? It's a uniform value that should be available for everything you want to compare.

Secondly, the use of language in the original question and some of the comments could be tightened up a bit, given the topic. Case in point, "complex to use". I suspect this ought to be "easy to use". "Use" is contextual, and subjective. It relates to who is using it, and how familiar or "at hand" it is to them (or not). Please try to avoid mixing up easy/hard and simple/complex, especially when the topic is an objective one such as complexity. Thanks :)