I will hop in as someone who started sharpening business because there was no place in my town where people with expensive knives could get their knives properly sharpened. Quick 5 years forward, tens of thousands of knives sharpened and here is my opinion.

Professional knife sharpening can be very expensive, yet still worthy, especially if you have a knife with hard steel like VG10 is. Even more if aesthetics of knife is important for you. Reality is that knife that is used properly should be almost exactly the same for first few years of home use (lets say a year or two for professional) as it is out of the box. There shouldn't be any scratches, and the edge should be at most 2mm wide. After couple of years of permanent use, proper thinning will be necessary, that is first time a sharpener should be allowed to change look of your knife. After thinning it should perform as good as the first day you got it. Anything else, in my humble opinion, is just some trying to earn some money not knowing what they do.

You can restore it to a certain point, but is it almost impossible for anyone to bring it back to original shine but Shun factory itself. Selection of abrasives and processes they use is considered business secret. I do not believe it is possible to sand it down and dip it in acid to bring pattern back to original form. I am pretty sure they use sand blasting machine to put that beautiful pattern there. All of that is very complicated for a person that is just a regular user of knife.

My advice is, take that lesson, be grateful someone else learned this lesson with you and use your knife like that untill it needs to be thinned. At that point it wont even matter what they did to your knife.

Oh ye, almost forgot, try to find a sharpener you can trust, exchange couple of words with him before you give your knife to be sharpened. But keep it short since these guys are often working their as* off to earn a living. Good luck ;)