There are a lot of pictures of the Walther Q4 SF on the internet, but something caught my eye that I believe one of you folks will be able to confirm or deny: Did Walther change the angle of the trigger guard slightly?
When the Q4 SF first came out, I noticed the angle was similar to the one found on a classic SIG P226. Some recent pics I've see of Q4 SFs appear to be more "squared off", like those found on a classic SIG P225.

I've wondered if perhaps some of those images supposedly representing Q4 SF pistols were in reality images of Walther's PPQ M2 polymer frame pistols? (The PPQ M2 trigger guard is really squared off like the SIG P225). The pics were unfortunately small and could not be zoomed in on to read the model designation. Thanks!

I don't own one, but every image I've seen for that model has the square (ala P225) trigger guard.

I do own one. The trigger guard is ala P225.
https://imgur.com/gallery/ngAeS3y

Thank you. I think after having looked at more pics of the PPQ M2 (and also of the PPQ SC), I figured out what the difference is: On the polymer frames, the thickness of the trigger guard appears to be a wee tad thicker and the front is more deeply serrated. Therein lies the difference, at least to my eyes.