I think I'd still rather have a nice matte paint on it, just me.
Not to mention the three pounds of material it would add to it.
That extra weight may cause you to get beat by a Zx14
I'm not pushing either way, even though painting a tank is alot more common.
Powder coating is much cheaper though and is a very tough finish.
The local powdercoater here has a wall of various old parts powdercoated in a variety of colors, and a few that look like expensive paint.
For someone looking for a solid colored tank it works great. A good pc gloss black looks like a mirrored finish, or as good as painted gloss black with several coats of clear, and it's hard to tell them apart.
I know very little about paint or powdercoat, but I have friends that do both.
From looking at the pc finishes compared to paint, it's as good a look for alot cheaper price(solid colors only of course).
You need to make sure all the parts are off and out of the tank so it can be baked, but if you can do that and are already going to the powdercoater; Why not?
That's assuming the powder coater is skilled and using quality products too.