I'm using the french fit, however my knee is over the crank, not behind it. I was fitted by Get-a-grip in Chicago, they are considered the fitting experts here. They will supervise the fitting of custom bikes. I asked them to recommend a Soma frame. A size 60cm Double cross frame was recommended, I'm 6' 0".
See for full details:
http://www.bikeforums.net/showthread.php?t=470912
"I’m a 6 foot Clydesdale at 230 lbs. Almost every bike model has a size large enough for me, but how do I know what models will be better than average in terms of fit? Bike fitting is a specialty, and most shops don’t offer in-depth fitting. In Chicago, Get a Grip Cycles provides a complete fitting for a fee. Considering that I would be spending 10 hours or more on a new bike every week, the cost of the fitting seemed like a good investment.
See here:
http://getagripcycles.com/page.cfm?pageID=93
The goal during the fitting was check the angles of the ankles, knees, hips, shoulders elbows & wrists as I rode upon a test bike. These were measured both while I was stationary and also by camera while pedaling.
After measuring my physical dimensions and range of motion, Adam was confident that fitting me to a bike would not be problematic. It was explained that the rider is positioned on the bike at three points, the pedals, the seat and the handlebars. Position those points correctly and the rider is comfortable, efficient and fast.
The Soma Double Cross in either a 58 or 60 frames size could be made to fit, but the 60 was closer to ideal. The fitting revealed that the 58 size would have required a well extended seatpost with rearward offset, this would have put my hips rearward of the ideal position to drive the crank. The solution was the 60cm frame size. The seatpost selected would have a zero offset to put the hips in the right place over the BB. The handlebars would be positioned by a 120mm stem positioned at a normal height above the tall headtube".