Sumiko F4 with 103R sounds flat???

I have a Sota Sapphire turn table, with Sumiko F4 arm. I am really disappointed. It doesn't come near my CD sound stage.
I am new to audiophile. Try to keep it basic, but what might be wrong?
Your phono stage might be wrong. What are you using, and what settings are you using for gain and loading?
The FT-4 has an adjustable VTA base. If you are running the arm parallel to the platter, try raising or lowering the back of the arm a few degrees & see if there are positive results.
ALSO, be sure that the tracking force of the cartridge is set at or near the MAXIMUM recommended downforce -- probably about 2 grams.