The Samyang 14mm f/2.8 is a decent ultra wide angle.
https://www.pentaxforums.com/userreviews/samyang-14mm-f2-8-ed-if-umc.html
Manual focussing though (but the depth of field is huge.)

Sounds like it might be more interesting to go to Comic Con for the photo opportunities!

Does Lightroom handle PSR raw images now (or were they jpegs?) I thought PSR raw development only worked correctly with PCU5.

If you check the exifs of those images you'll find they're closer in focal length to each other than what you state.

Image 1:
Focal Length: 95.0mm (35mm equivalent: 142mm)
Aperture: ƒ/5.6

Image 2
Focal Length: 58.0mm (35mm equivalent: 87mm)
Aperture: ƒ/4.5

Not withstanding that, as John said, the subject shown is practically flat. If you photograph a newspaper page at different focal lengths you wouldn't expect the resulting photos of that page to look any different to each other apart from lens distortion differences.

Try the experiment again with the badge around a metre in front of a discernible background (say a newspaper page) and there will be quite noticeable differences.

Then try it again at the extremes of your telephoto, 18mm and 270mm and see what happens.

Agreed raw does slow things down a lot and the files are large so I quite understand. Where it really helps is taking photos in towns/cities on a sunny day where there are extremes of contrast. Also if you wish to try HDR processing from single file (otherwise you'd have to bracket the exposures.)

That's basically all you'd normally do with raw fies so it needn't take any longer. However, if you wanted to bring out some detail hidden in the shadows or tone down some burnt out highlights, then the raw file would help enormously with the shadow detail whereas a jpeg with burnt out highlights might not be fixable at all. You realise there's always the option to take raw + jpeg?

If you're taking aircraft against a bright sky the raw file should help greatly sort out any contrast differences.

If one takes raw, the out of camera images aren't much use without doing something to them. You couldn't for instance upload an OOC raw file to PU.
While OOC jpeg images can indeed be fine, in awkward lighting situations the ability to bring out shadow and highlight details from a raw file cannot be overlooked which is what photographers have done for decades from film negatives.
Often OOC images have extraneous matter at the edges of the frame which is difficult to avoid using a prime lens as opposed to cropping in camera with a zoom. Selective cropping has been done with film for decades too.
Then an out of camera image on film would be pointless without processing it. The moment you visibly saw an exposed negative that hasn't been processed it would be fogged and be rendered useless.
By processing is PS or something, one is only carrying on what has been done in photography since photography was invented.

Know what you mean!

That would be really helpful too Algi !

How does one hide the classified adverts from appearing in the recent posts list please? It seems about three out of every four threads relate to for sale items and these do get somewhat repetitive, especially when they go bump bump bump all the time! Thank you.