In general, do you think that sales people who studied sales and marketing perform better than those who didn't?

It does not always follow.  There are people who never had  formal education about Sales and Marketing and yet they perform well in the field.  Most of them are honed by extensive (actual) experience, and not rely on theories.

Sales is a skill which is being developed by practical experience.

As concern the basic difference between the sales educated person & normal sales person is that the educated one first read theory than goes to practical and second one first goes to practical & than writes the theory.

Not necessarily Because a lot of people have not studied marketing or sale but they achieve a huge results in sales field why ?because this field needs talent of negotiation , skills of convince , In addition to Personal Characteristics , but the study reinforce and support these elements .

Regards

It does not always follow. In my view, let it be any stream education makes an individual aware of all pros and cons, teaches him proper and new techniques but a person who faces the ground reality is the core person and he/she can be designated far better than an educated person. 

If we specifically talk about sales or marketing, these two fields require creativity, talent and adherences to ground reality and these two skills mean more than education 

Not necessary.  It is a built-in skill

Sales & Marketing studies only  helps in organizing this skill

Sales is a talent. You can't teach someone how to convince people because they will be fake. Studying helps people to develop their skills and show them the path where they can be better salespersons. 

May be valid for general merchandise. When we are talking about B2B sales, or, to be more specific, technical products, knowledge on product and related technology is crucial and no Marketing training can replace that. and this is due to the sensation of comfort a Sales individual should provide to the buyer.

Definitely, more productive and work smarter

Yes and no.

Yes, because big part of such studies (be it rewarded with an academic degree) contain practical training in their core curriculum structure, equipping students and future professional with valuable applicable selling, marketing, presentation, negotiation skills etc.

No, because the talent for self-teaching and quick learning may exceed that of official degree holders when put to the practical test (including business jargon). An electrical engineer, who's operating in sales, may be more fit to market and sell a heavy industrial machinery than an MBA.

Yes definately, new knowledge brings something to improve the skills and transfer knowledge help to improve the capacity. Who are invoves in new learning, they will be better who are not involves in leanring new knowledge.

I believe a formal education does provide a foundation with which you have the tools to build yourself. It might not be a necessity, but certainly does give you some kind of a platform (or an advantage if utilized properly).

However, experience, aptitude, customer centric thinking, and the will to push boundaries is what defines whether you end up in success or fall flat to the ground.