Pea coat arm length, how long?

I just got a new pea coat and was wondering what's the general rule on the arm length. Everything else about the coat fits great but I feel the arm length is a tad long. The sleeve on my coat ends at the halfway point of the palm. Is that too long? should it be at the wrist? I'm used to wearing fit, snug jackets that hug your body but I understand a pea coat is supposed to be a little roomier.