lookin at the pic, its not really unsharp. the edges of the pillars are sharp and there is details in the staircase.
i suspect there is lots of stray light around as the floor was wet. and if u tink the vehicles are soft, perhaps they really are. cus w the engine on, they are vibrating, and w a slower shutter, will appear fuzzy.
dun tink "diffraction blurness" will be visible on film, not small ones anyway. or even bigger ones. cus when u blow up excessively, the pic comes apart cus of grainsize/noise.