Double check that you have the "closest subject priority" switched off for normal shooting. If it's on, you may be trying to focus on the subject, but the camera will focus on whatever is closest to it.
I have mine set up as follows:
WB - mostly auto lately as I only shoot RAW and can adjust later and it seems to do a reasonable job
Colour - STD
Tone - STD
Sharpness - OFF
Hope this helps. How is yours set up?
I note that JT seems to shoot in BW mode with the obvious spectacular results, but I've never tried as I read somewhere that it was just a grey scale image that loses lots of information. Is this true?