I think, at this point, further comments from me on the MKII would be too much assumption and guessing. About the DT being immediate versus the Octatrack, I generally don't agree with this statement. I get where it's coming from, but the DT is jut easier to get to that point because there's less to get to grips with and as such, you learn some things faster.
But as @Open_Mike says, once you've got the Octatrack, I don't think it's less of an immediate sampler than the DT, mainly because I think the DT's reputed super fast workflow is a bit like the emperor's new clothes - it's there because you want to see it and because compared to other Elektrons, yes, it's immediate. But as a sampler in general, it's a head scratcher for many at first. I've got two friends who got the Digi as their first Elektron. They love it now. They didn't, at first.