Nobody else seems to have mentioned this so maybe I am wrong but I would have doubts that the F6 will give you anything in the way of higher resolution or better prints in the same size compared to the F100.

If you have your heart set on the F6 and it does have some advantages over the F100 in certain circumstances then go for it but you might be disappointed if you expect it to deliver the same advantages in terms of prints as MF as well as having the advantage of fabulous AF as the added bonus.