I removed 'ambient' from all textures (except cathedral facade),
reduced radiosity brightness to 0.6, reduced 'diffuse' to 0.6 and
reduced sky brightness.
You can see the result below. Let's decide which value for
assumed_gamma we should use.
IMHO we should use something from the middle 1.4-1.6 even
though such value is not right from theoretical point of view :)

Gena.

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Preview of image 'gamma1.jpg'

Preview of image 'gamma2.jpg'