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I'm not sure what you mean by "Lenses that require "green button" stop down metering because the camera can't read the aperture setting properly."
Anyway, this all seems like a pretty off-topic and pointless thing to complain about.
Well, Pentax cripped the KAF2(?) mount so that the camera can't read the aperture setting on lenses with an aperture ring. The green button is used to stop down the lens, take a light meter reading, and open it back up. It is a nifty solution, but a solution to a problem that really ought not to exist in the first place. I have owned and shot Pentax DSLR bodies and found this annoying as hell. Other than that I think their bodies are in general well designed and thought out. The K20D I shot was incredibly intuitive and well put together, with lots of nice features.
Also, the new "XS" lens for the K-01 (and presumably successors) according to the news bit on Pentaxforums loses compatibility with DSLRs and SLRs altogether: "Perhaps the most interesting thing we've learned tonight is that Pentax has plans to take full advantage of the Pentax K-01's mirrorless construction. The new and unnamed SMC Pentax-DA XS lens, pictured above, will extend closer to the K-01's sensor than a normal K-mount lens would. The rear lens elements will be located in the area which would otherwise be blocked by the mirror on a DSLR. "
That really has me wondering what the hell they are thinking over at Pentax. They introduce a mirrorless that is fatter than all the existing ones because they want it to retain K-mount compatibility, then proceed to work on K-mount lenses that won't fit anything other than mirrorless bodies. I think they would have been far better off to make a thinner body, throw in a "free" K-mount adapter, and have a more flexible platform to build on.
Between that and the very confused-seeming marketing of the K-01 (it's got K-mount so people can use existing lenses, but we leave out a viewfinder because we are aiming towards people buying their first non-P&S camera and don't have any legacy lenses nor care about them) I wonder just what the hell Pentax is up to, and as a former Pentax shooter (starting back in the mid-90s with a ZX-M) I get really annoyed at what they are doing with the brand and products.
But, you are right, this is probably not the right place to vent my frustrations.
As for the Canon thing, I still read the Pentax forums since I have been a long time Pentax owner and the topic of "well Canon bla bla" comes up entirely too often, talking about how Pentax has maintained the wonderful compatibility while glossing over the little details like what I mentioned above. I think it gives people the erroneous impression that everything is perfectly compatible and they end up disappointed when things aren't quite what they appeared.