Yes. Sneeze and you'll scratch the window.
When I got my CM 690 II, the side panel was not perfectly flat, it had a very slight concave curve. This dropped any cpu clearance height by a good 3-4mm. This happens, more than ppl admit, so coolers with extremely tight tolerances for clearance could be a slight issue. The windows on that case are acrylic and scratch as easily as a cheap pair of sunglasses, and while quality control at CM is usually pretty decent, it is possible for the welds that seal the heatpiping on the top of the heatsink to be off by 1mm.
On the other hand, there's more than a few cases that state a certain clearance, but in reality they short-changed the measurements due to different side panels. A plain metal panel having 6mm or more clearance due to interior mounting of the window (4mm acrylic etc) so the measurements are based on the smallest size, not the particular panel. Some windows are indented, so actually have more internal clearance than a plain panel, so a 159mm clearance in reality is closer to 164mm, allowing for plenty of cooler choices.
But it's pot-luck. Somebody on the TT faq said 160mm. The 212 evo is stated as 159mm, the 212 Led is stated at 160mm.
That's a whole lot of finger crossing and hoping everything fits to save a few $. The Cryorig H7 not only is a better cooler, at 145mm tall it fits easily with no worries, no ram clearance issues, one of the best mounting systems in the business (the hyper212 mounting is miserable to get right). The H7 has every advantage possible in an air cooler over the 212 in any version except for 1. It's a few $ more.
The fans on my coolers don't exceed 750rpm. They are capable of 1000rpm. Would sticking a 2000rpm fan on it make it better? Not in the slightest. Just means it's less efficient per rpm.
You could throw 40 heatpipes into a cooler, wouldn't make it better than one with 6, just means there's 40. The heatpipes transfer heat like a candle wick, a more efficient heatpipe doing more that 2x inefficient heatpipes. It's all in the engineering and design, not in the actual looks or build.