Thanks!Excellent. The gear is very good. More important is the photographer who knows:
• which building to pick.
• know where to get the vantage point to shoot.
• having the patience to wait for the right time of day or sometimes evening "Blue Hour" to photograph.
• having local knowledge to be able to caption the photo of the building.
Left hand side of photo #2 shows edge of Guoco Tower may give impression of converging vertical distortion.
But I think nothing wrong with the lens. That is the shape of the building.
One part of Guoco Tower has a slanted edge with the base wider than the top.