I'm very tired of my 5.6" phone (Pixel 3A). 5.4" seems a small upgrade, but maybe worth it. I've been on the Android camp for a decade, but I'm getting fed up with these enormous phones. It's ironic that there's a million Android manufacturers and zero good small Android phones, while there is one iPhone manufacturer and they may actually take the small phone market.
Because of aspect ratios and bezels, the 12 Mini is significantly smaller than the 3A. The 12 Mini is smack dab between the size of the iPhone 5 and the iPhone 6, whereas the 3A is roughly the size of a current iphone 11.