1- Does Canon GL2 has true 16:9?
You mean are the CCDs 16:9? No. It's best though, to get equipment info straight from the manufaturer's website. In this case, that would be:
http://www.usa.canon.com/consumer/controller?act=NewProductsAct&fcategoryid=102
2- What is the solution to get film results from Mini DV?
What do you mean by "film results"? Do you mean dust and scratches? If so, many editing programs let you add that in post. Do you mean 24p? If so, you need a camcorder that has that feature.
3- What would you do if you shoot something on Mini DV and plan to send it to an indipendent film festival ?(not everyone owns a 16mm, right?)
Which festival are you considering entering? They will have a website with their requirements, entry fees, etc. Just "Google" the festival name.