Yeah, i do!! its been kinda hazy here in Los Angeles the pass couple days. Maybe thats other factor to poor IQ? How can i get the best DOF? sorry for my lack or knowledge.
Learn more about DoF. Take a look at this site.
Online Depth of Field Calculator
Play around with the DoF calculator. Select your camera, choose the focal length, enter the f-number and the subject distance. It will show you the Hyperfocal distance whcih is what you need to put the focus on. You maybe amazed how DEEP the DoF is. Few feet from your camera to Infinity.
To increase the sharpest of the photo during shooting for scene like that, using a tripod, remote shutter and mirror lockup do help in certain degree. (May not be too much, but do help a little depends on situation)