Differences between words describing someone who is expert in many things

Renaissance is usually talked about in relation with the Renaissance Period. Though it may be used in this sense, I guess, but I am not sure if it is advisable.

Polymath is adequate. But please note that it usually implies that a person is an expert in several different subjects, you cannot become a polymath if you only know many subjects. Also, polymath is also used for someone who is very knowledgeable, which in this case is also applicable, so another +1 for Polymath.

Versatile is defined as begin capable of or adapted for turning easily from one to another of various tasks, fields of endeavor etc. So basically it means a person who is adaptable, can easily do tasks of a different nature. It may be used in this case, but note it, by using it you will be praising the adaptability of the person instead of his knowledge.

Aficionado is someone who is very knowledgeable and an expert in a subject. But in this case you are only referring to the person's expertise in one subject. It isn't usually used when talking about a person's skills in many subjects, which is the case.

Really, the word "Renaissance" should be replaced with the term "Renaissance Man". Because in American English the word "Renaissance" means the same thing both in denotation and connotation as it does in British English. Which, of course, has nothing in and of itself to do with an appraisal of expertise. However, the term "Renaissance Man" refers to a cultured man who has "acquired profound knowledge or proficiency in more than one field." (dictionary.com) Quintessential examples of this would be Leonardo da Vinci (artist/anatomist/visionary) or Benjamin Franklin (printer/writer/statesman/diplomat/scientist/inventor).