Is Gulf Arabic (Khaliji) a very important dialect in Arabian world ?
It's said that Gulf Arabic is widely spoken in some countries such as U.A.E, Saudi Arabia, Qatar and Kuwait, so I'd like to know how useful it is to learn, and if Gulf Arabic is very similar to "Modern Standard Arabic" (MSA), if it is more important than Egyptian Arabic or any other dialects. As far as I know, it would be essential, for those who's been learning MSA for some time, to concentrate on Colloquial Arabic, for example, Gulf Arabic (Khaliji). Sincerely I hope everybody can speak your mind freely about my question. Thank you very much!

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i think the most important dialect in Arabian world is Egyptian ( old movies spoken) and Syrian (new serial stories and most easy )

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Since I am from the Arab Gulf region, specifically from the area of Saudi Arabia, the classical Arabic language and is inherent in my country, is the true foundation of learning Arabic language 
because the Arabian peninsula is home and place of the original Arabic language 
As for the Gulf dialects in the Arabian Gulf region, in my belief that it was not able to speak out do not think he knows the Arabic language in its proper 
And the language is easy and understandable for all Arab countries because they sense of health and elegant and not comparable to any Arab accent