When I decided to buy another M film body in 2011-2012, I considered all the ones I'd had before carefully. The M3 and M2 simply didn't appeal to me, for reasons I cannot easily articulate. The M4 was delightful but at the time M4s in good shape that I could afford were unfindable. My second favorite body in prior times had been the M4-P but I preferred the M4 viewfinder with its simpler frameline setup. The M6 and M6TTL that I had ... well, I liked the M6 but wanted the M6TTL meter display, or none.
I decided on the M4-2, preferably an early series one, and lucked out in finding a pretty nice one listed in rough condition on the KEH website. It was $720, their notion of "rough condition" was to me a "very good+" condition cosmetically, but the viewfinder was full of dirt and the rangefinder sticky and inconsistent. I had my local tech at the time check it out: he cleaned, collimated, and calibrated the viewfinder, found the shutter was a little slow at 1/1000 and 1/500 but not by enough to matter (about .5EV and .3EV respectively), and charged me $110 for his efforts. I was out shooting with it again yesterday. Still needs a shutter overhaul, still works just fine.
The M4-2 early series has exactly the same viewfinder optics as the M4, and the same thin frame lines without rangefinder patch flare, unlike the later models. The film wind is slightly noisier than the M4 and earlier because the gears are steel instead of bronze, which also means they are strong enough to use with a motor winder should I choose to (never have). There are a couple of minor other issues with the M4-2 as they came out new, which have long since been well known and easily corrected.
I love the camera, will never sell it.
When I bought the M4-2, I picked up a CV Color Skopar 50mm f/2.5: this is a wonderful lens, I still use it. I also found an early M-Rokkor 90/4 which is *exactly* the same lens as an Elmar-C 90mm f/4, built in Wetzlar by Leica, but with the M-Rokkor bezel and a 40.5mm filter size. It works beautifully on the M4-2.
In 2015, I happened on a nice shape '72 Summilux 35 v2 that had already been vetted on the M9 and M240 bodies. I had DAG code it for use on the digital bodies and have used it on M9, M-P240, M-D262, M10-M, and, of course, the M4-2. I'll never sell that either.
The M4-2, Summilux 35, Color Skopar 50, and M-Rokkor 90 are my standard film M kit. The 35mm cost me as much as the body and the other two lenses put together, and was worth every penny.
Good luck on your quest. Consider an M4-2 body ... they tend to go for less than the M4-P, M4, M3, and even M2 bodies (or at least they once did) as they have been looked down upon by Leica M fanatics over the years. Having used one for a decade, I can't really see why. (I don't really know what current prices are like at all... I only look at prices when I'm looking to buy something...
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G