Do what I just did - bid on the ones you fancy!

There are a couple of reasons for waiting for the Pentax 645D.

The lenses are plentiful, affordable and excellent. The operating logic and ergonomics are the same as Pentax 35mm and DSLR cameras, so no confusion over operating style. For those with existing 645 or 67 kit they will have existing compatible lenses and/or accessories. The Pentax 645 concept is less modular than other marques, so all the add-on items such as Pentaprism finder and auto exposure are already added in.

There is logic to waiting and sticking with the same marque for 35mm, DSLR and medium format options.

With an adapter, you could use this on a DSLR...if you could lift it.

You need the Adobe site for updates to the Adobe Camera RAW, which will included the latest pentax cameras shortly after they were released.

I've used three of these - the Fuji S602Pro was quite good, the S7000 was very good and the S9600 was very poor, a real backwards step.

I currently have a Pentax T30 always in my jacket pocket. It is capable of taking quite sharp pictures of anything that needs recording, but the small sensors will always mean that ultimately it is nowhere near DSLR quality.

The sad truth is that even if you spend £300 or more you will still not get the same quality as your K-x. I have never found any compact camera that is really up to scratch, and I include the Rollei 35 models and the Minox ones as well in that. Some are not bad, but that's not the same as the SLR quality experience.

Compacts at the higher end of the Pentax range (you get what you pay for) are great for casual shots, holidays, parties, recording accoidents and other events and they also shoot great party videos all fine for Facebook or YouTube. I need one of these type of cameras, but it takes a lot of skill and care to get the highest quality out of them. Any of them.

It depends on its date of issue, because when the M series started there were no Lithium batteries in common use.

Is your RAW converter updated to recognise your PEF files? Updates are needed for every new camera model as the PEF files are camera specific.

The Sigma has more distortion than the Pentax 12-24mm, which is a magnificent lens. I'd forgotten you had the Sigma. In any event the small lens is one thing, but it is expensive duplication of focal length.

Obviously only you can decide whether the lens(es) in question can be justufied, but if you want one then go for it! Which one though.....that's not easy for anyone to say as it depends entirely upon your own photography.

I would get a 12-24mm f4, much more versatile and impeccable for architecture.