Even at ISO 100, JPEGs can have these horrible crunchy artifacts in non-close-ups. I think it's partly due to oversharpening, which can be adjusted in-camera. However, there's no similar problem for macro or zoomed-in shots, so there's no way to globally set the appropriate level of sharpening to cover both situations.
(1/100 sec, f4.0, AWB, pattern metering, 14mm lens)