Sorry to bump this, but I've started researching more and I'm uncertain whether to choose MK4 or MK41. I've downloaded "Hungry Heart" by Springsteen live in Philadelphia Oct 20, 2009 which has both a MK4 (taped by Nicky C) and a MK41 source (taped by Tapehead2) and to me the MK4 sounds more upfront and the instruments less "meshed" together compared to the MK41-source, whereas MK4 sounds more prone for audience noise. Also the recording positions are different, centre floor vs section 211 so I know that's a important factor to consider.
Apart from using my own ears, what are your own experiences? Why did you choose MK4 over the MK41, or vice-versa?