I have finally purchased a Sailor pen after all these while. It is a Sailor 1911 Large size Realo. I was reluctant earlier because I thought the design of the pen was too similar to the other pens that I have, particularly the MB. But I took the dive and am now totally amazed by the nib performance.
Japanese nibs are finer than their European counterparts. I usually use a Medium nib but for this Sailor, I ordered a broad nib which wrote like a medium nib.
The "large" was not particularly large. It is a tad smaller than my M800 and MB 146 but it writes ok. The pen has fantastic balance. Here is a quick photo of the pen. The ink window is well implemented.