TexasCHLforum.com

I've yet to see it myself

Only checked the pictures of the PX4 and descriptions.

According to IMFDB.org (very cool site btw, Internet Movies Firearm Database), the main character (Leo) does carry a PX4 Storm. It has a threaded barrel and is chambered in .45 ACP. A few screenshots with suppressor on too.

I will refrain from posting the link directly to the Inception entry for IMFDB.org since there is a spoiler warning.

I used to own a 9mm Type F. I sold it because I am not a big fan of slide-mounted controls. However, after having owned different brands and makes of firearms, I realized how much I missed the PX4. All 5 points from the OP are exactly how I feel about that gun.

It is very likely I'll purchase another one in the future. All the good things I continue to hear about it now just makes me want to purchase one sooner.