I've changed some options related to font rendering by
defaults write command in past (I can't recall was it
lcdfilter, or something else).
Now when I turn off antialiasing in system preferences font are still looks antialiased, but have less weight (see screenshots).
Note, I have Retina display, so, this could be normal behaviour, but I'm not certain, that's why I decided to ask about it. If this is not default behaviour (it seems to me, that fonts too heavy when antialiasing turned on), how can I rollback changed values to defaults?