@Vitaliy_Kiselev (and maybe @CBrandin) as you may remember Panasonic had provided to french FNAC customers (a big book/electronics shop in France) some alternative firmware, that apparently change the color profiles. I don't know shit about what your work around film mode consist in, but maybe it could help to compare them with official firmware (as I think colors is the only change). These firmware are here (login/pass : panasonic/lumix) : http://panasonic.jp/support/global/cs/dsc/download_f/
It is very old firmware. My understanding is that changes are not related to color profiles, but to general color related things. It is quite hard to spot any difference. But thanks for idea.