“But that's minor!”: minor maybe, but that’s an issue. Yes, both the central and corner symbols (“pips”, as they are called) are almost the same size.

It’s even worse with the court cards (aka “picture cards”: jack, queen, king). Out of laziness and for space-saving, they all share the same design: their suit symbol, in big, in the center (and the two corner pips). Not easy to distinguish between them easily/quickly, especially if your sight isn’t good.

I should do something about all that, one of these days. Thank you for your feedback!