Upload & Sell: On
I've owned all 3 (25 f:2.0, anf the 35 twins). Basically, the 25 is closely related to the 35 f:1.4. Both are extremely good in rendering very minute and subtle detail, like faint colour variations, 3D in OOF areas, and the likes. This is an area where they outclass the 35 f:2.0 and even the 21 Distagon. Their rendering is thus not very spectacular, because eveything is so gradual and finely differentiated. The 35 f:2.0 OTOH has a strong "Wow! factor" because its lower detail creates strong differentiation and the lens is well-regarded for 3D. This lens' bokeh can be a bit busy at times, whereas the f:1.4's is creamy, as is the 25's. Because of the f:2.0's lesser priority on detail than on sharpness, it looks a bit like a macro lens, not a look that I love for landscape.
AFAIAC, once I was familiar with the f:1.4's subtleness, and knew where to look to find it, I was hooked, and even sold my 21 for the 25.
FYI, on this forum to say that any lens does anything better than the 21 is politically incorrect, and the f:1.4 does not quite have as many fans as the f:2.0.