On the Leclerc, the only user beside France, are the UAE - nobody else, apparently.
The only "Western" user of Abrams tanks, is Australia. Four other customers of the US who decided for the Abrams, are all close Middle East clients of theirs. Taiwan is considering it, so is Peru.
The Leopard-2 is used outside Europe in Singapore, Turkey, Canada, Indonesia and Chile. Practically all European tank-armies are using Leopards, except the French and the British, who use their own tanks. Its more than 12 users, therefore - 12 was the number of SBP users.
The challenger-2 serves only in Britain, and Oman.
To find a tank more successful in finding customers than the Leopards, one would need to check the Russian tanks. The T-55 - obsolete by now - has been in use in over 50 countries. They still can be met in third world conflicts.
The superzoom in the M1A2SEP is, I think, not so much for shooting, but for correctly identifying type and team of the blip the gunner sees in the thermals. That should not mean that you cannot also shoot with it.
