I just switched over from Pentax, a 7-year APS-C user, and I must say that I'm not the least bit surprised by delays on their part. I endured it with several lens releases that rarely happened when they were supposed to. I also didn't care to wait for their FF anyhow because their AF probably still would not be on par with Nikon or Canon. And even if it somehow is, their FF glass is still more expensive than the equivalent Canikon lens. For the record, my D750 absolutely KILLS any Pentax I ever owned in terms of AF capabilities! I'm entirely glad that I've made the switch!