135mm temporary replacement

[dave_t]

first post, looks like a great forum!

Unfortunately, I come with bad news. The other day, my wonderful and loved CZJ 135/3.5 literally fell apart in my hands while I was focusing to infinity. Don't know what happened, but it's in for repairs, which will take a month. Unfortunately, I don't have anything in the 135mm range to take its place.

I'm wondering if somebody could maybe give me some suggestions as to what I could use to fill the void. I'm looking for sharpness more than anything (will also be used with a 2x teleconverter). I've considered just buying another CZJ, but I'm not sure how much I would want to have 2 once this one is repaired, but it's what I may end up doing anyways.

I'm looking for lenses in the M42 mount, thanks!