Regretting buying this 14mm now that I got it

For those frustrated with converging verticals there are some solutions (probably many more, but here are a few):

1) Make sure you shoot perpendicular to the floor. If your camera is at a 90 degree angle to the ground, your verticals will be parallel. They a tripod with a bubble level, a hot shoe bubble level or the in camera level. (problem is you might not get the top of you image in the frame)

2) Use a shift lens. For the X cameras, kippon makes a nice shift adapter for Nikon lenses (and others). As their image circle is larger than the sensor, the image can be shifted downwards to get more of the top in the frame.

3) Shoot wider (back up) and crop.

4) Get high. No, not like that. I mean, use a long poll with a tripod mount on the end to get your camera up higher (ideally to the vertical center of your image). Climbing up of stuff works as well.

4) Post process as has been shown here. Leave a bit of convergence though. Looking up naturally creates converging parallels, it is just that our brain sorts them out and makes us think we are looking at parallel lines.

Hope that helps some.