I found a DA* on eBay for a very good price, but I forgot to change my primary address to a US one, and the bid was not accepted (I used a sniping tool, so I found out when it was already too late).
Maybe it's destiny... for a few dollars less I found a Sigma EX DG HSM in spotless conditions, with box, hood, etc. I made an offer, it was accepted, and now it's on its way to a US address, where my wife will pick it up in a few days.
I will get it before Christmas. It will be my self-given gift for the festivities
Of the three lenses, I suspect that the Samyang would prove a tiny bit better optically, and it would be cheaper, IF you can find one second hand (which is not very easy, few have been sold in PKA mount). Though this lens has its weaknesses: the build is not on par with the others, and it's not AF. Considering I have plenty of very good vintage fifties, I don't regret I didn't buy the Samyang when I found one second hand at a convenient price. Under a practical point of view I need a fast AF fifty much more than an MF one.
The DA* seems to work fine even after the SDM motor develops the squeaking noise. The build is good (for a modern AF lens) and bokeh and central sharpness are very good, judging from the pictures I have seen online. Though it has its limitations: the AF is slow and it's impossible to convert it to screwdriver AF, and the lens was originally designed to be a portrait objective for APS-C. Vignetting and border sharpness are not outstanding, and unfortunately there is no Lightroom correction profile made for FF.
The Sigma has fast AF, good sharpness stopped down (not outstanding wide open), decent bokeh. A pity I have to use it on APS-C only until I can ship the lens to Sigma to have the bayonet exchanged. I don't want to scratch the body
None of the three lenses is perfect.
The one close to perfection - probably the state of the art of current fifties - is the new D FA*.
For my specific needs it is too expensive. Which means that I'm not so sure it's too expensive in general, I would probably see everything under a different perspective if I just bought a K-1 II and had to build my lens arsenal from scratch. Though in my situation, and considering my tastes (I'm not crazy for absolute sharpness), the investment on the D FA* would be excessive. I already have plenty of valuable vintage fifties with different optical signatures, usable in different conditions and for different purposes (including three f/1.2), and I also have two Pentax F/FA fifties with screwdrive AF. I just needed an affordable fast fifty with better performance wide open and across the frame. The silent AF is a nice plus.
For 270 USD shipment included I hope it will prove to be money well spent.
The only real pity is that I didn't remember that the 50mm EX DG HSM was part of the group of lenses that scratch the body of the K-1.
I checked only after committing to the purchase. The problem is not really about the scratch, I sent my other two affected lenses (24-70mm and 120-400mm) to be repaired on warranty because in the process Sigma technicians always update the firmware to the last version. Often it makes a huge difference. So it's always better to have the lens serviced, even if you don't care about the scratch.
While I am writing these lines it came to my mind that I have no idea if the free bayonet upgrade service had a time limit or not. Does anybody know anything about this matter?
Last edited by cyberjunkie; 11-08-2018 at 12:45 PM.