The following is a simple picture I drew and colored to highlight the differences in color and quality in each of the different marker pen brands tested.
Test Bic Marking Fine
Test Sharpie Markers Fine
Test Stabilo Point 88 Fineliners
Test Staedtler triplus Fineliners 334
Test Faber Castell Connector Pens
Test Faber Castell GRIP Finepens
Test Staedtler Noris Club Fibre tips
Test TOUCHNEW Sketch Markers
Test Art n Fly Dual Tip Fineliners