I would say yes. Half Dome is awful distant and hazy but it sure looks like I remember it. From the picture's perspective, the cliff to the left in the picture has to be El Capitan. They are not THAT close together actually. El Capitan is about midway up the Valley while Half Dome is at the extreme east end.
I found a photo on the web with the same perspective but was unable to capture. Here are separate photos,
[Broken External Image]:
El Capitan
[Broken External Image]:
Half Dome