AF is highly beneficial when flying at low altitudes, where the ground textures are viewed at large angles and high mip-map settings has no effect. Without AF, ground textures looks very muddy and washed out at low altitudes. Of course, if you're up above the clouds all the time it doesn't matter since the viewing angle favors mip-mapping layers, but it makes a huge difference down low.
At any rate, I reverted back to a previous driver and things are in order again. Seems that the new Omega driver for AMD cards is defective. GPU scaling doesn't work and it's selection mechanism in the CCC is bugged (even preventing use of the old non-native resolution workaround), and changing settings shows no effects in OpenGL apps, including AA, AF, and multilinear filtering.
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