Canon continues with firmware updates, and this EOS 5D Mark III firmware v1.1.3 update appears to have slipped by un-noticed by me as the page at Canon says it was updated on 8th of June it was probably lost with the EOS 650D announcement. Probably the most important item for me is the support of the new EF 40mm f/2.8 STM pancake lens, but as

The folks at Magic Lantern are no stranger to adding new features to Canon DSLRs, courtesy of their EOS Camera Tool software. Their latest creation, Dual ISO, increases the dynamic range of the 5D Mark III and EOS 7D by four stops, bringing the total dynamic range to 14EV. This allows you to pull detail out of the shadows with a lot less noise I have a Canon EOS 5D Mark II camera I have not used in several years. New firmware updates are available. CN-E45-135mm T 2.4 L F - Version 1.4.0. EOS 1DX Mark
This firmware upgrade for EOS 5D Mark IV features a log gamma setting that maximizes dynamic range and provides a wide exposure latitude. Canon Log makes it perfect to shoot in tricky lighting conditions where there are high contrasts between bright and dark areas, as it reduces the chance of important details missed out by over / under-exposure.
1D X Mark III, Many lenses, Pixma PRO-100, Pixma TR8620a, LR Classic New firmware updates are available. CANON 5D MK4 : SD CARD WRITE . 159 402 223 419 438 135 439 256

canon 5d mark iii firmware