Sure, different amount of money is different easy or hard to spend for everyone depending also on the timespan of her/his life.
Having said that at taking into account usual prices for lenses in the 90mm focal length with the reported qualities, the price of the 1.8/45 from Olympus seems a real bargain for me - have ordered one and expect delivery next week. For any of the APSC or FF equivalents you pay easily at least twice this money with not the same quality.
WRT 12mm lens, I so far deferred to order one, as it seems to big for me, simply I would have preferred a smaller and lighter design with a bit less fast.