Different guy. I just flashed the update and got the phone back to basics (just the google apps).
See caveats below. With those caveats, the camera is faster for me. I launched it from an icon, and by the time I calmly moved finger to the shutter it was ready to shoot (and did). It couldn't have been much more than a second. I would call the light level in this room "low to medium"...my droid would have flashed under the same conditions (5x didn't). The quality was better than I would have expected under the circumstances.
I'm not the best judge of this issue for a couple of reasons:
1: My last phone was a droid turbo, and the lag between launching the camera and getting a shot and between shots was awful.
2. I've only had the 5x for a couple of weeks, and I never experienced the camera lag (but I had a very low bar based on previous phones).
It would be silly to draw any conclusions from this little experiment, except maybe that fresh out of the box the camera on my phone performs very well under less than optimal conditions. I'll update this after I get the phone back to working condition and it's got a few apps running.