I talked to him. It's the KDL-40V4150. I still need to check it out.
Doing a search online, it seems to be in the "For Business" part of Sony's store. I wonder why the place my dad bought from had that one and not the 4100.
I've got the KDL-40V2500 and found it to be one of the best price/performance TVs for me. Yes, it was a bit more expensive than other similar sized/spec'd TVs, but I liked the picture best on the Sony. I spent a lot of time staring and tweaking store displays before I picked the KDL series.
CV, I'm sure your dad will enjoy his new TV set!
