Cantonese is spoken by about 100+ million people worldwide. That's not very much compared to, e.g., Mandarin and since it has never really been a literary language, it is by far not as important as Mandarin.
The above comment strikes me as a value judgement, violating the [Neutral Point Of View]?. Catonese is pretty important to Cantonese people, I would imagine. I would simply point out the number of speakers (which is more than all but maybe a dozen or less languages) and the fact that comparatively few works of literature are written in it.
Linguistically, Cantonese is a more archaic dialect than Mandarin. This can be seen, for example, by comparing the words for "I/me" and "hunger". They are written using very similiar characters, but in Mandarin their pronunciation is quite different ("wo3" vs. "e4"), whereas in Cantonese they are pronounced identically except for the respective tones. Since the characters hint at a similiar pronunciation, it can be concluded that their ancient pronunciation was indeed similiar (as preserved in Cantonese), but in Mandarin the two syllables acquired different pronunciations in the course of time.
Again, this sounds more like an argument that Cantonese is a worse language than Mandarian than an encyclopedia article about it.
Finally, there are a few points where you have written your article in the first person. While it is appropriate for many sorts of writing, even scientific papers these days, it's not really appropriate in encyclopedia articles.
This article is already informative, and in my opinion just needs a bit more work to be really good.
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