Knife designer Chris Reeve was conservative when he designed the Sebenza that defined the fit and finish standard in the OP's $350 to $600 price range. Hinderer followed and Les George, Koenig, Olamic, Hoback, William Henry, Liong Mah, Medford, Rockstead and others in customs, productions and midtechs are all up there now. Many of these will pierce a car door and look the role.
Great fit and finish in folding knives are even available today for under $200. Skaha II, Laconico Keen and Megalodon Titan are three that come to mind and Monterey Bay Knife just had the $225 Minpin and an EZC run coming up.
Shirogorov F3 and Sander Contra at $700 to $800 entry price point is well above the stated range. But this is where the slicing tanks are. Russians make great stout full flat grind slicers and fixed blades, thick behind the edge but with good steel can have a hard 17°-18° micro bevel. Good for food prep and light bushcraft. As a work knife, no other full size folder has challenged my base single row bearing Shiro F3.
Super high end decorated folders in the multi-thousand dollar range are another story.