My late wife was No2 Lady ellow of the Royal College of Surgeons of Edinburgh and also had a Diploma on Orthodontics at the Royal College of Surgeons of England as well as BA and a dip Music and grade 8's in most reed and piano. OK, I inherited her wire cutting and bending kit. Her wire cutting pliers, both pairs were from Maun Industries and are similar - and probably the same as those sold by Ferrees in the USA.
These can cut piano wire up to 18G and the jaws are not 90 degrees or anywhere near but about 45 degrees. Clearly, I have seen and used professionally pliers which have a 90 cutting action on the side. I had a pair of insulated pliers primarily for removing ESME seals etc
Anyway, have a look at Ferees catalogue on the net.
Regards
Norm