Tell us what you think about it, a short review would be nice

The thing with RAW is that it is unprocessed data from the sensor and the camera and lightroom process them differently.
Also the settings from the camera only are applied to the JPG-preview inside the RAW, that's what you see when previewing the photo inside the camera not the actual RAW file.

That infra-red filter is all software based, they alter the coloured image so much that it looks like a infra-red but off course it isn't.
You can still use real infrared filters, the problem is the filter infront off the sensor blocks infra-red so you need longer exposures. Nothing to do with the CMOS sensor.

That's the thing.
The camera will always record in colour and then alter those images to mimic a B&W image. Since RAW is truly raw information from the sensor it does not have those digital filters applied only to the embedded JPG preview in the RAW.

Since you can't do that, the simplest thing to do is to make developing setting preset that mimic the digital filters inside the camera.
You can apply them to all photos you import, to the selected photos or simply a single photo.

Lightroom already have some standard pre-sets you can use, maybe they are good enough or you can adapt those and then save it as a preset. You can also save adjustments you made to an photo as a pre-set.

The sensor still only can records in colour because there is a fixed bayer filter in-front off it, there are sensor without such a filter and they simply record the luminance but they aren't use in standard DSLR cameras.

If I understand correctly you want to import the RAW files from the camera with the camera settings?

I don't believe you can do that because Lightroom re-renders the RAW with his own engine and therefore create a new image out off the RAW information.
The simplest thing is to use or create a developing setting that you save as a pre-set and apply to your photos, this can be applied during importing or when editing photos.

I loved it as well, I doubt many here have seen that film

Yes, contrast AF is merely software. It's a program that analyse a part of the photo and try to get the most contrast by focusing the lens. It's already used in liveview, compacts and evil cameras.
The problem is you need a processor fast enough to render the film and run the AF contrast program reliable, also that they can't detect if it's front focused or back focused so they can't track, maybe that's one of the reasons they aren't use?
The only thing the sensor has to do is deliver the images for the program to analyse, I don't see why that would be sensor bound or put extra strain on the sensor so it would overheat.

The preproduction firmware of the K7 actually had AF while filming but they removed it for some reasons.

That's a decision you've to make on your own.
All I can say it a zoom does speed up the progress because you don't have to switch lenses but the FA 77 has the f/1.8 and the image quality... it's a hard choice.
SRS has a very good price for the sigma now, if you don't like it would you lose much if you sell it second hand? If not then there is little to lose right.

One went on Ebay for £307.97 yesterday so you risk around 90 pounds.

But if it has video it can do it off course. it just need the firmware to do AF contrast so Pentax has to do it themselves.

Yes indeed, the pre production model had it.

But AF isn't in the sensor though.

Have you set the auto lens correction feature on maybe?