I've started running a comparison of colour films and am currently processing and scanning 7 transparency films and 5 negative films. These encompass (I think) all of the colour films available in at least 4x5. I'm using Portra 400NC in my current tests but will be getting hold of some of the new 400 as soon as possible.
In the first test I cocked up the exposure of the Ektar (double exposed it) and there is a but of a gap between the first six transparency films and the negative films (so the E100V will have the sun in a slightly different position).
I'm using two graphmatics to hold the films in order to have as little time between exposures as possible. I'm going to be taking 9 more shots in this comparison tests and I should add that Digilab in Newcastle-upon-tyne, UK have processed the film for free for me (i.e. they sponsored the test).
Hope you find the results interesting - I realise already that any comparison has it's faults but hopefully it's better than no comparison.
If you have any suggestions of the types of subject or conditions for the remaining shots, please let me know (the next shot is of a half polarised blue sky with a green fir tree with very dark pine cones and orange/red female cones).