I have a M645 1000S with:
- 55/2.8 very good (I'll change it with 45/2.8)
- 80/2.8 I didn't use a lot(I want change it with 110/3.5 or 120/4 APO)
- 210/4 very excellent
- 145/4 soft focus
- 50/4 shift
I use only normal lens so 80mm 2.8 is the only i have and is super sharp.
For flexibility and fun with MF, start with an 80/2.8--sharp, cheap, and plentiful.
I concur. The 80 2.8 is a great performer at a cheap price. It was my first lens for this camera. I also have the 150/4.0--great for portraits, scenics, whenever you want a longer than normal view. My current favorite is the 45/2.8. A heavy piece of glass but gives a fresh new perspective. You can't go wrong with any of the above.
I use the 45/2.8 N and the camera came with the C version. The N version of the 45 has superior coatings and flare control, having compared both.
My advice is to use lens hoods as well.