the G30 was made for golf... it was supposed to be a lens that would aplify your contreast to read the fairways/greens better.  
it makes things pop, i have IO's but a pair of splices with G30 just for overcast.  Lance Armstrong uses em In his jawbones, and rory mclroy uses em in the his tours.  IMO the most versitile lens on the market... i have used mine from sunny to night and eveything in between!