Mizuno has successfully blended traditional forged aesthetics with modern performance; use the M13 for precision in short irons and the M15 for distance and forgiveness in long irons.
Their scorecard
Forgiveness: 3/5 — Low on M13 mishits
Workability: 5/5 — M13 is very tour-inspired
Feel: 5/5 — Classic Mizuno forged feel
Turf interaction: 5/5 — Triple cut sole is excellent
Distance: 4/5 — M15 adds ~5 yards
What they rate
Authentic Mizuno forged feel and sound
Both models look like blades in the bag
Innovative triple cut sole technology
Excellent high ball flights for holding greens
What they don’t
Stock shaft weight may feel heavy for some (120g)
M13 shows significant distance drop-off on mishits
Mizuno has successfully blended traditional forged aesthetics with modern performance; use the M13 for precision in short irons and the M15 for distance and forgiveness in long irons.