I had the same experience consulting with Dr Saiffi. He estimated 1500 grafts for density whereas Dr Yaman estimated 4000. Massive difference. Dr Villnow is in the middle at 2800 grafts.
Also see what the level of consultation is like. If it feels personal and detailed and your questions are answered you may get a good feel from them.
As I have consulted with many doctors and for me personally I have found some pros and cons with all of them. Remember these are just my personal views from consultations and research
Dr De Reys:
pros- good location, very personal and not technician based (his wife is his assistant), very good reputation online, pricing very reasonable
Cons - conservative approach if looking for a significant procedure, surgery will take a very long time as he does not have a large team (also a pro depends how you look at it) Not too many recent cases on the forums, a lot of them are from around 2014.
Dr Villnow - pros: very experienced, not technician based, very good level of consultation and understanding, online cases look very good,
Cons: not very much of his work online, price is slightly higher than many of the Turkish doctors,
Dr Hakan Dogonay- pros: price is very reasonable, has some very strong results online, appears to be improving after some poor results, was once regarded as a top class doctor
Cons: reputation online was very bad a year ago after some poor results, communication is very short and abrupt, has been known that technicians have been doing most of the work.
Dr Saiffi - pros: good reputation online, communication is very good he even called me to discuss my expectations. He was very confident that you do not need a high number of grafts to show density. He says it's all about angle and placement.
Cons: personally I prefer a more aggressive approach and higher graft numbers. He wants you to use a laser comb of which I do not believe in. The waiting list is very long and also the price is slightly on the high side
Dr Yaman -
pros: recommended on here. Aggressive approach to graft numbers. Price is very good for a recommended surgeon.
Cons: is technician based, I haven't seen many full 1 year results on here as most of his results on here are very early stages. Communication is slow and I somewhat lost confidence due to the slow nature of the replies.
Dr Cinik
Pros: price is very very low, some good reviews on here
Cons: is a technician clinic with every patient paying the same amount of money. Seems fairly new to the community and not many full 1 year results online.
Dr Erdogan - pros: world renowned reputation. Amazing results and consistently amazing results posted online
Cons: price is a touch higher than others (but still pretty good)
Dr Bhatti (India)
Pros: very good reputation online, price very good, a happy medium of graft estimation, does beard hair
Cons: a few complaints online from a small number of patients. Also depending on where you live it is very hard to get a direct flight. From the UK I couldn't find a good flight from any London airport.
I must stress this is from my own research and my own consultations.