Suppose you got your answer already. With Pentax, generally I explore the scene and focus while looking at the image in the microprism section of the center... The image turns clear and sharp decisively... After "practicing" this way for a while, I'll go out and actually use the camera, focusing as quickly as necessary for the shot I'm taking. Yes, focus on what must be sharp, then move to compose so the shapes are pleasing in the viewfinder and take the picture, if it is worth it.