OK, So about 4 years ago, I started stocking up on low ISO films starting with Techpan before it disappeared for use in projects in the distant future. I have about 200 rolls of TP in 35 and 100 in 120. I also have 100 rolls of APX25 in 120 only. I have tested a roll of each in both formats to make sure it is good and it is fine ( brilliant actually ). Here is the thing. To shoot for now to get my darkroom and black and white shooting skills really up to snuff, I have a good supply of Pan-F in 35mm and 120. Now while I like this film a lot, even APX 25 is noticeably less grainy ( at least in Rodinal 1+50 ). In fact, it is truly a tragedy that it is gone because it might be my favorite film yet. I have heard good things about Efke 25 and I have heard bad things in terms of quality control. So we now have ADOX 25, Rolliepan 25 and even a brand new Rolliepan ATP V1 technical pan film coming out in 120. If one were to try to replace APX 25 or even Techpan in 120 with a super sharp and tight grained variety to shoot along side of Pan-F, what might it be?