First of all, I live on Stockwell Road. I have read that you live in Haughton and I am originally from Haughton (spent my 1st 20 years there), so I am very familiar with that area. I just moved back to the area, I was exiled to Savannah GA (for about 1 yr) and Monroe LA (for about 5 yrs). I am now 27 and glad to be back!
I agree that they would probably not put a PF Changs and Pei Wei that close together, but they are still very different. As you know PF Changs is an upscale dinner type atmosphere. Pei Wei's is a nice casual quick lunch type atmosphere. Somewhere the office may go for lunch.
I have had San Francisco Oven. CPK is so much better, but again they are very different. SFO seems like a nice deli/pizza lunch stop. CPK is again an upscale restaurant that serves very trendy type food. Check their web site and their menu, especially the pizzas. Everything has a fresh, organic feel. They are in Dallas, so next time you're there you may want to try it. The BBQ Chicken Pizza and Singapore Shrimp Rolls are awesome! Back when the Boardwalk was being developed I emailed Mr Good about getting a PF Changs and CPK. He replied advising that they were not able to get them because of conflicting restaurants. Then of course Gimme Sum and SFO were announced. Speaking of, do you know anything about Gimme Sum's future. Last I knew Shreveport Times did a story hinting at a rift between the company owner and the franchisee as the reason it was temporarily closed.
http://www.cpk.com/
BTW, I looked at some of your pics. What zoo is that? I definitely does not look like the DFW Zoo.