That's like asking "Do all Americans have good handwriting?" I think you know the answer would be "no." I'm almost certain we all know at least one person whose writing is like a massive wad of non-identifiable lines and scribbles, no matter what language it is. Legible calligraphy takes practice~ Assuming that everyone has a gift for it would be faulty.

No. Because my handwriting letters are aweful. However, some of my friends' are extreamly beautiful, but not ALL of my friends.

At least my handwriting is like a DISASTER lol And most of us suck at it... We use MS Word for writing, so it doesn't matter anymore.

In my experience - almost no one.