It would be nice to buy CMT bits in 8mm shanks. Unfortunately none of kits linked in the post above have 8mm shanks.
Festool used to offer a fairly broad range of 8mm shank bits in the the states but they did a poor job of marketing them.
They sold sixty or more bits but only used a dozen or so images to identify them.
For example, Festool had a range of bits like the CMT bits above but only used one picture of one bit to describe them.
You had try to decipher the mouse type to figure out what the actual bit might be.
Because of the poor descriptions and the top dollar price they didn't sell well.
Another reason for poor sales was the shank/price ratio. 8mm is substantially smaller than 1/2" but the 8mm Festool bits
cost at least as much as the best quality 1/2" bits so I think a lot of people felt the Festool bits were not a good value.