Have some Canon lenses lying around?
Canon EOS EF mount lens to Fujifilm Fuji X-Pro1 XPro1 X Pro 1 FX Camera Adapter | eBay
On using an 85mm (135mm equiv)
X-Pro 1 with Canon EF 85mm lens (5 photos): Fujifilm SLR/X100 Talk Forum: Digital Photography Review
Bigger lenses look ridiculous, but hey it works.
Canon EF "L" lenses on Fuji X-Pro 1 (photos): Fujifilm SLR/X100 Talk Forum: Digital Photography Review
The downside? Well apart from looking a bit touched in the head, MF only and here's the kicker, you need to pre-set the aperture on a Canon camera, since Canon has done away with the aperture control ring on their EF lenses.