What lens are you shooting with? If it has image stabilizer, did you let the IS "settle in" before taking the shot? Are you shooting with a UV filter? If so, have you tried taking off the UV filter to see if that makes a difference?
You photos definitely look soft and there does not seem to be any precision focus plane, so doesn't look front/back focused to me. Thus I'm asking what lens you're shooting with.
I tried to provide samples from various conditions (all shots as processed by camera... can share some RAW later if required)
Here we go!