documentclass{article}

usepackage{tikz}
usetikzlibrary{svg.path}

begin{document}
  % Original
  begin{tikzpicture}
    draw svg "M 256 8 C 119 8 8 119 8 256 s 111 248 248 248 s 248 -111 248 -248 S 393 8 256 8 z";
  end{tikzpicture}
  % Mix of relative
  begin{tikzpicture}
  draw svg "M 256 8 C 119 8 8 119 8 256 s 111 248 248 248 S 504 393 504 256 S 393 8 256 8 z";
  end{tikzpicture}
  % Mix of relative
  begin{tikzpicture}
  draw svg "M 256 8 C 119 8 8 119 8 256 S 119 504 256 504 s 248 -111 248 -248 S 393 8 256 8 z";
  end{tikzpicture}
  % Full absolute
  begin{tikzpicture}
  draw svg "M256 8 C 119 8 8 119 8 256 S 119 504 256 504 S 504 393 504 256 S 393 8 256 8 z";
  end{tikzpicture}
end{document}