Ratou
Active member
Mark III is more raw, dry & vintage sounding. Mark IV is easier under the fingers, slightly more HiFI / 3D sounding, awesome lead channel. Cleans are amazing on the Mark III - maybe a tiny bit better than on the Mark IV. The controls and tonal options on the Mark IV are 10 times better than on the III. The shared controls make so that you can really only one really good tone at a time without changing the changing the knobs / eq (same issue as on c+). If you can find a good deal on Mark III i'd say go for it so you can see the difference for yourself, they are both great amps. The Mark IV might be the desert island amp for me (ahead of a III and IIC+) given the amazing lead channel and how good the controls are.