in 550D, the case is more pleasant to the touch, purely personal sensations. plastic parts have a rougher surface. the ISO button is located a little further from the edge, it is not customary to pull the finger to it (my fingers are not very long, I have to intercept). the zoom and start video buttons are noticeably more convex. the wheel is louder while rotating, the cross, when pressed, seems to click louder, taking into account the fact that the screen is touch-sensitive and all actions can be performed on it without being critical. the complete 18-55 STM lens works quietly, unlike the 40 STM, it buzzes noticeably.
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