To add support for metaclasses, replacing 'self.__lt__(other)' with 'type(self).__lt__(self, other)' will work. 

The performance degradation for the common case is about 25%:

$ py -m timeit -s 'from tmp import a, b' 'a >= b'     # op_result = type(self).__lt__(self, other)
1000000 loops, best of 5: 283 nsec per loop

$ py -m timeit -s 'from tmp import a, b' 'a >= b'     # op_result = self.__lt__(other)
1000000 loops, best of 5: 227 nsec per loop