[arch-general] Pacman-key keyring and my own GPG key

I have just upgraded to pacman 4, and as instructed I executed "pacman-key --init". It generated new GPG key "Pacman Keychain Master Key <pacman@localhost>" and imported it into pacman keyring. The question is: should i replace it with my own private GPG key that I use normally? I understand that it should all work well with the generated one, but since I already have GPG key, then wouldn't it make more sense to use it instead of generated one? If the answer for that question is yes, then is it better to import my GPG key into pacman keyring or instruct pacman to use my regular gnupg keyring at ~/.gnupg ? Maciej