It is often difficult or not impossible to capture usable skies in real world locations. Trees or buildings in the horizon easily obscure the view and make it difficult to integrate the sky to CG scenes.
That’s why we also create ultra photo realistic HDRI panoramas on demand. We can create any kind of weather, time of day or even real world estimation of a natural light based on GPS and date and time.
These HDRIS are 16K resolution, but even higher resolution is possible, up to 24K. The reflections rendered using these HDRI are crisp and pixel perfect, but also the lighting is realistic blending seamlessly with the rest of the scene.