You simply don’t have that. The range of pricing from the kitchen dealers/furniture stores, etc. offering kitchens is so broad that you can’t deduce anything from it. From many experience reports on Kuchen-Forum.de, it’s rather the case that you can get the highest percentage discounts in large furniture stores because their main sales strategy is still to lure customers with percentages. Many small studios and local kitchen dealers work with immediately very realistic prices. There, bargaining is often limited to rounding down to the nearest 100, 500, or possibly 1000.
Kitchen planning and pricing is something very individual. You can get a kitchen that looks initially visually identical for probably double the price if, for example:
[*]Side panels, etc., are lacquered instead of plastic
[*]Drawers with glass sides or made of wood instead of standard tubs
[*]Luxurious lacquer finish on the fronts instead of melamine fronts or to-be-avoided foil fronts
[*]Higher carcass (e.g., 78 or 80 cm) instead of the oh-so-popular 72 cm high carcass from Nobilia, and together with the higher carcass, more drawers
All of these can be things that are not recognizable at first glance, which unfortunately also makes it quite difficult to compare different offers