Yeah, a resemblance, as in all of the options are the same. Gunsight view, bringup guages, wingman view, target view etc. Even the key commands are the same lol, wingmen dialog and subtitles presentation, layout and font, the sun, sky, clouds, even the same weird violet twilight. Damn the ID font is the same. BTW with 3rd party mods janes has higher res skins than IL2 allows.
Anybody who has played jane's and IL2 and says that the similarities aren't uncanny isn't being honest with themselves. I think most people in the flight sim community have known more or less that IL2 was built on jane's. If there had been no jane's wwII fighters there would be no IL2 today. True there are some who will vehemently deny it, but I think you'll find that they're types who seldom let reason cloud their emotions. That could be said for any brand loyalist. Be it WWIIOL or Mac.
Well oleg did say that janes wwii was his favorite game and you'll notice that some of his people have built mods for jane's.
Don't take my word for it, get yourself a copy of Jane's, you probably won't even need to remap your keys. And try some of the hi-res mods for it. I haven't tried them but the screenies look very good, instrument glass reflections that move etc.