the 7/05, 11/18, and diploma are all the same blend but the 7/05 and the 11/18 are all what are refered to as pregnant cigars meanign they fatten up in the middle but are still parejo shaped. I have smoked many of all of the sizes and tend to think that funky sizes of the 7/05 and 11/18 do not compliment the aroma of the cigar. Diploma is by far the best.
The maduro is really mainly more of a dark natural wrapper on the same blend.
The liberty is great but pricey. The current blend is good but next years blend is supposed to be amazing. This years liberty is shaped like the 7/05 which is very fat in the middle but is 8 inches long with a muduro wrapper. The 2005 edition which comes out in a few months will be the same size as the diploma with a maduro wrapper and 10% pre-embargo filler.