Yes, there is a difference.

I own a Rolleicord with a Tessar 3,5/75 and a flex 3,5F with a Planar 3,5/75.

For critical work (brickwork that reaches to the corners) you need to stop down the Tessar to f/8. Half a stop wider open, f/6.7 may be accceptable, but you see a difference.

The Planar can be used at every case at f/5.6 and may be at f/4.7, that is "one stop faster" for the same image quality. Wide open the Planar is slightly soft in the corners but quite sharp in the center. The Tessar is soft even in the center at f/3.4 and f/4. May be used for portrait work, but not for landscape or architecture.