Boy Henro, you really know how to start something when the biggest loud mouth on the board is not around! I've obviously missed something by not being around this weekend, but I also have been a pretty vocal proponent of the curved arms. So while i am very late to the thread, let me weigh in.
First, I think one of the biggest advantages is seeing the ground in front of the tractor, not seeing the bucket itself. On both the
B2910 with 60" bucket, and the TC24 with 54" bucket, I cannot see the side of the bucket because in both cases the buckets are too wide.
What I can see with the TC24 is objects closer to the leading edge of the bucket and object in front of the tractor. When scooping up a pile of mulch or digging into a dirt pile I would say that there is ABSOLUTELY NO ADVANTAGE TO THE CURVED ARMS of the TC because under those circumstances you are trying to fill the entire bucket.
However, when trying to pick up someting with the bucket, the sloped hood and curved arms allow for closer viewing of objects to let you line up the item (such as a decent size landscape rock) into the center of the bucket. Or when trying to scoop up chunks of wood. Or any other task when the entire bucket will NOT be filled up, then the added visibility is an asset to speeding up loader work.
As for the pictures and the comparisons that are posted in the body of the thread, let me say that I think they are not entirely valid comparisons. First, from the standpoint of ANY user, the pictures must be taken from the viewpoint of the SAME driver's eyes. If a 5'2" person takes a picture while on the seat of a NH and a 6'4" person takes a picture while on the seat of a Kubota/JD/Mahindra/Etc then the perspective will be totally different. We need a picture of SIMILAR size tractors take by IDENTICAL size drivers. Further, we need objects placed in front of the bucket at premeasured distances, and we probably need one row in line with the center line of the tractor, and then one row on either side of the center line, at probably 24" off the center line. Each of those 3 lines would then have marks placed every 12" inches? And the lines of sight, as shown from the perspective of the same driver, could actually be measured.
As I have 2 loader of different makes that are of near equal capacity, I might actually volunteer myself to take this project on. It would likely be sometime over the next weekend because I come home from work late and the sun is setting early so getting meaningful shots will be difficult.