Originally Posted by another_shot

I took a quick look, FI502 KEF-AMS showing 5 rows of C, rest of the flights showing 4 rows. And all flights no 1DF seats. IIRC that "old-style" 757 with 4 rows of C had full row 1. Wording from FI you quoted above could also mean they designated rows 5&6 for eco comf on those flights, while actual seats are business.
When looking on some random flights CPH-KEF-CPH there are some with 4 rows of C and some even with 3 rows. Unless FI did a total reconfig of their fleet within last month, this not sounds like actual seat map. It looks they allocating some of business seat to eco extra.