6MT car here, and I notice it for sure.
If the car has sat overnight or more, it take 1-2 seconds till it turns over. If I have fired it up within the last 6-8 hours it starts right up.
Not sure if it is battery related as I do believe I am still on the original battery.
Alpine White E92 M3 - 6MT
AG359's 19x10 Square/RS Spacers/AW Reflectors/AW Gills/Gloss Black Kidneys/LUX H8 V3's/Exotic Tuning Spoiler/KW Sleeveover/Magnaflow Axleback/Borla Xpipe/ BMW Performance Knob