Depends upon which seats are fitted. Std seats have.tilt, hight, angle of squab, and seatback angle adjustment.
My E34 has sports seats, which in addition to the above has electrically adjustable.lumbar support. Also nice are the individual central folding armrests, plus heated squabs and backrests.
My E39 seats are the same as std seats in an E34, and they're not as comfortable as the sports version. The std lumbar support just doesn't suit me, but I do realise that others might not have the same problem. Mike.