Flying TK 80 (SFO-IST) in J in April. It's a 77B showing the 49J cabin. Can't find much in terms of seating charts or photos of this config, but it looks like there's 4 rows of business, then a galley, then a 3 row minicabin.
Was probably just going to select 3J/3K, but perhaps the minicabin is in some way preferable? Seems possible it's not well separated from economy and has noise issues, etc. Any one with experience on one of these 49J aircraft want to share their opinion?