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cmpthese( -1, {
    k1 => sub { $foo->do_nothing },
...
    k7 => sub { Foo::do_nothing()},
    k8 => sub { &Foo::do_nothing }, 
});

       Rate   k2   k1   k3   k4   k6   k7   k5   k8
k2 379516/s   -- -14% -31% -34% -35% -38% -48% -48%
...
k7 614031/s  62%  39%  11%   6%   5%   -- -16% -16%
k5 727406/s  92%  64%  32%  26%  24%  18%   --  -1%
k8 735179/s  94%  66%  33%  27%  26%  20%   1%   --