Thank you all... I am getting it, now, think.

Canon 50 mm f/ 1.2L, f/ 1.4 USM, f/ 1.8 II all have a longher minimum focusing distance than the Canon Macro Lenses, in fact.

Surprising, macro lenses from canon don't go below f/ 2.5, while non-macro ones go up to f/ 1.2 ...