I’ve just upgraded to the 13”M4 from the 11” M2 and testing the iPad only work flow on a current work trip to Europe. I was, and would still be, perfectly happy with the performance of the M2 but the M4 seems even more polished and smooth. It is very hard to describe but the M4 seems to be better in every way. The 13” definitely makes the difference in allowing an iPad only life. I definitely noticed the difference in the weight of my backpack vs. the 14” MBP M1 Pro I’ve been carrying for two years. Battery life is great and the iPad fit better on airplane and train tray tables - but not as good in the lap….