Ignore it. If your listing and photos are accurate for your item, that's all you need to worry about.
With a little luck (it happens all the time) there will be something in your photos or listing that doesn't apply to his listing and he'll get nailed by a buyer and eBay on a not-as-described case. If not on your listing, on some other person's listing he steals. Karma is alive and well on eBay.
But basically unless he's using your actual name/ user i.d. somewhere in all that, his shenanigans won't do you any harm. If you try to chase down everyone who's stealing content from you on eBay, you're going to have a time-consuming new hobby. At the very most I'd hit the "report" button on his listing and follow the prompts, and then promptly forget about it - and even that's a waste of time IMHO.
(And yes, it's happened to me many times. The first few times you feel outraged. After that, especially when they borrow text and photos that are only marginally applicable to their stuff, it gets amusing.)