One of the MX 23's most notable features is its long and wide pocket cavity, which nicely balances the weight away from the club face.This creates a larger sweet spot and promotes good ball flight, important in a forged iron.
MX 25 cavities are similar; however, they are filled with Mizuno's three-dimensional "X" back design. This feature fills the cavity more and, according to Mizuno, offers better weight distribution than the MX 23s.
Mizuno MX 23 irons are forged from 1035 mild carbon steel. This offers a soft feel and easy workability through a variety of lies. MX 25 clubs contain a bit less carbon with their 1025 carbon steel construction. This, the company claims, is a better and softer option than the 1035 steel and promotes a better center of gravity. Both models are plated with nickel chrome.
Stock Shaft Differences
Mizuno MX 23 irons are equipped with True Temper Dynalite Gold, S300 (Stiff) or R300 (Regular flex) shafts or Mizuno's Exsar Blue, available in stiff (S) and regular (R) flex .While these are solid shafts, the MX 25 irons come stock with Dynalite Superlite (stiff or regular) or Exsar IS2 (stiff, regular, lite flex). These options are slight upgrades to the MX 23 shafts; however, shafts on both models are capable of solid performance.
Whether the differences in the MX 23 and MX 25 soles significantly affect playability is debatable. Both clubs have a triple-cut sole. However, the 25s have a more rounded training edge. This, for some players, may help with making solid contact from the fairway.